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Topological magnetic dipolar interaction and nonlocal electric magnetization control in topological insulator heterostructures (2016)

Stefan Rex, Flavio S. Nogueira, and Asle Sudbø

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-09

Beschreibung: Author(s): Stefan Rex, Flavio S. Nogueira, and Asle Sudbø The magnetoelectric effect predicted in topological insulators makes heterostructures that combine magnetic materials and such insulators promising candidates for spintronics applications. Here, we theoretically consider a setup that exhibits two well-separated interfaces between a topological insul… [Phys. Rev. B 94, 020404(R)] Published Thu Jul 07, 2016

Schlagwort(e): Magnetism

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Classification of magnons in rotated ferromagnetic Heisenberg model and their competing responses in transverse fields (2016)

Fadi Sun, Jinwu Ye, and Wu-Ming Liu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-09

Beschreibung: Author(s): Fadi Sun, Jinwu Ye, and Wu-Ming Liu In this paper, we study the rotated ferromagnetic Heisenberg model (RFHM) in two different transverse fields, h x and h z , which can be intuitively visualized as studying spin-orbit coupling (SOC) effects in two-dimensional (2D) Ising or anisotropic X Y model in a transverse field. At a special SOC cla… [Phys. Rev. B 94, 024409] Published Thu Jul 07, 2016

Schlagwort(e): Magnetism

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Commensurate and incommensurate magnetic order in spin-1 chains stacked on the triangular lattice in Li_{2} NiW_{2} O_{8} (2016)

K. M. Ranjith, R. Nath, M. Majumder, D. Kasinathan, M. Skoulatos, L. Keller, Y. Skourski, M. Baenitz, and A. A. Tsirlin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): K. M. Ranjith, R. Nath, M. Majumder, D. Kasinathan, M. Skoulatos, L. Keller, Y. Skourski, M. Baenitz, and A. A. Tsirlin We report the thermodynamic properties, magnetic ground state, and microscopic magnetic model of the spin-1 frustrated antiferromagnet Li 2 NiW 2 O 8 , showing successive transitions at T N 1 ≃ 18 K and T N 2 ≃ 12.5 K in zero field. Nuclear magnetic resonance and neutron diffraction reveal collinear and commensur… [Phys. Rev. B 94, 014415] Published Wed Jul 13, 2016

Schlagwort(e): Magnetism

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Theory of magnon motive force in chiral ferromagnets (2016)

Utkan Güngördü and Alexey A. Kovalev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): Utkan Güngördü and Alexey A. Kovalev We predict that magnon motive force can lead to temperature dependent, nonlinear chiral damping in both conducting and insulating ferromagnets. We estimate that this damping can significantly influence the motion of skyrmions and domain walls at finite temperatures. We also find that in systems with… [Phys. Rev. B 94, 020405(R)] Published Wed Jul 13, 2016

Schlagwort(e): Magnetism

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First- and second-harmonic detection of spin accumulation in a multiterminal lateral spin valve under high-bias ac current (2016)

Shaojie Hu, Tatsuya Nomura, Ginga Uematsu, Nagarjuna Asam, and Takashi Kimura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): Shaojie Hu, Tatsuya Nomura, Ginga Uematsu, Nagarjuna Asam, and Takashi Kimura We have investigated the transport properties of electrically and thermally excited spin currents in a lateral spin valve consisting of a spin injector and detector with a middle ferromagnetic wire by detecting the first- and second-harmonic voltages. The first-harmonic spin signal was significantly… [Phys. Rev. B 94, 014416] Published Wed Jul 13, 2016

Schlagwort(e): Magnetism

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Long-range antiferromagnetic order in epitaxial Mn_{2} GaC thin films from neutron reflectometry (2016)

A. S. Ingason, G. K. Pálsson, M. Dahlqvist, and J. Rosen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): A. S. Ingason, G. K. Pálsson, M. Dahlqvist, and J. Rosen The nature of the magnetic structure in magnetic so-called MAX phases is a topic of some controversy. Here we present unpolarized neutron-diffraction data between 3.4 and 290.0 K and momentum transfer between Q = 0.0 and 1.1 Å − 1 , as well as complementary x-ray-diffraction data on epitaxial thin films of… [Phys. Rev. B 94, 024416] Published Wed Jul 13, 2016

Schlagwort(e): Magnetism

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Exact asymptotic correlation functions of bilinear spin operators of the Heisenberg antiferromagnetic spin-1/2 chain (2016)

T. Vekua and G. Sun

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): T. Vekua and G. Sun Exact asymptotic expressions of the uniform parts of the two-point correlation functions of bilinear spin operators in the Heisenberg antiferromagnetic spin- 1 2 chain are obtained. Apart from the algebraic decay, the logarithmic contribution is identified, and the numerical prefactor is determined. W… [Phys. Rev. B 94, 014417] Published Thu Jul 14, 2016

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Parity-time symmetry breaking in magnetic systems (2016)

Alexey Galda and Valerii M. Vinokur

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): Alexey Galda and Valerii M. Vinokur The understanding of out-of-equilibrium physics, especially dynamic instabilities and dynamic phase transitions, is one of the major challenges of contemporary science, spanning the broadest wealth of research areas that range from quantum optics to living organisms. Focusing on nonequilibrium dynam… [Phys. Rev. B 94, 020408(R)] Published Thu Jul 14, 2016

Schlagwort(e): Magnetism

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Helicity, anisotropies, and their competition in a multiferroic magnet: Insight from the phase diagram (2016)

M. V. Gvozdikova, T. Ziman, and M. E. Zhitomirsky

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): M. V. Gvozdikova, T. Ziman, and M. E. Zhitomirsky The ability to explain and predict the behavior in magnetic field is essential for any possible application of multiferroic materials. Motivated by the complex phase diagrams of MnWO 4 and other spiral multiferroics, the authors formulate and investigate the anisotropic next-nearest-neighbor Heisenberg (ANNNH) model, which is a generalization of the celebrated ANNNI model to three component quantum spins. Using real-space mean-field simulations allowed for an unbiased construction of the magnetic phase diagram with multiple commensurate and incommensurate states. In particular, the biaxial anisotropy can explain the puzzling nonferroic reentrant phase of MnWO 4 at high magnetic fields. The employed numerical technique is capable of predicting the temperature and field dependence of the ordering wave vector produced by the competition between helicity and anisotropy. An important issue raised in the present study is the effect of quantum fluctuations on the devil’s staircase known to exist for the ANNNI model, but which is replaced by a “floating” incommensurate phase for the ANNNH model. [Phys. Rev. B 94, 020406(R)] Published Thu Jul 14, 2016

Schlagwort(e): Magnetism

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Magnetic properties and Curie temperatures of disordered Heusler compounds: Co_{1+x} Fe_{2−x} Si (2016)

Julia Erika Fischer, Julie Karel, Simone Fabbrici, Peter Adler, Siham Ouardi, Gerhard H. Fecher, Franca Albertini, and Claudia Felser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): Julia Erika Fischer, Julie Karel, Simone Fabbrici, Peter Adler, Siham Ouardi, Gerhard H. Fecher, Franca Albertini, and Claudia Felser The local atomic environments and magnetic properties were investigated for a series of Co 1 + x Fe 2 − x Si ( 0 ≤ x ≤ 1 ) Heusler compounds. While the total magnetic moment in these compounds increases with the number of valance electrons, the highest Curie temperature ( T C ) in this series was found for Co 1.5 Fe 1.… [Phys. Rev. B 94, 024418] Published Thu Jul 14, 2016

Schlagwort(e): Magnetism

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Optically induced spin-dependent diffusive transport in the presence of spin-orbit interaction for all-optical magnetization reversal (2016)

Mehrdad Elyasi and Hyunsoo Yang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): Mehrdad Elyasi and Hyunsoo Yang We have considered the effect of different spin-orbit interaction mechanisms on the process of demagnetization under the influence of short-pulse lasers. All-optical magnetization reversal of perpendicularly magnetized thin films can occur if there are sufficient strong spin-Hall, skew scattering, a… [Phys. Rev. B 94, 024417] Published Thu Jul 14, 2016

Schlagwort(e): Magnetism

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First-principles modeling of longitudinal spin fluctuations in itinerant electron antiferromagnets: High Néel temperature in the V_{3} Al alloy (2016)

Sergii Khmelevskyi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-19

Beschreibung: Author(s): Sergii Khmelevskyi The V 3 Al alloy with D O 3 crystal structure belongs to the family of the very few metallic materials that exhibit a magnetically ordered state with a high ordering temperature (∼600 K) and consist only of nonmagnetic elements. We show that, similarly to the ferromagnetism in the fcc Ni (with ordering … [Phys. Rev. B 94, 024420] Published Mon Jul 18, 2016

Schlagwort(e): Magnetism

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EuCo_{2} P_{2} : A model molecular-field helical Heisenberg antiferromagnet (2016)

N. S. Sangeetha, Eduardo Cuervo-Reyes, Abhishek Pandey, and D. C. Johnston

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-20

Beschreibung: Author(s): N. S. Sangeetha, Eduardo Cuervo-Reyes, Abhishek Pandey, and D. C. Johnston The metallic compound EuCo 2 P 2 with the body-centered tetragonal ThCr 2 Si 2 structure containing Eu spins-7/2 was previously shown from single-crystal neutron diffraction measurements to exhibit a helical antiferromagnetic (AFM) structure below T N = 66.5 K with the helix axis along the c axis and with th… [Phys. Rev. B 94, 014422] Published Tue Jul 19, 2016

Schlagwort(e): Magnetism

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Role of spin-orbit interaction in the ultrafast demagnetization of small iron clusters (2016)

Maria Stamenova, Jacopo Simoni, and Stefano Sanvito

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-20

Beschreibung: Author(s): Maria Stamenova, Jacopo Simoni, and Stefano Sanvito The ultrafast demagnetization of small iron clusters initiated by an intense optical excitation is studied from the time-dependent spin density functional theory (TDSDFT). In particular we investigate the effect of the spin-orbit interaction on the onset of the demagnetization process. It is found t… [Phys. Rev. B 94, 014423] Published Tue Jul 19, 2016

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Neutron spin-echo study of the critical dynamics of spin-5/2 antiferromagnets in two and three dimensions (2016)

K. F. Tseng, T. Keller, A. C. Walters, R. J. Birgeneau, and B. Keimer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-20

Beschreibung: Author(s): K. F. Tseng, T. Keller, A. C. Walters, R. J. Birgeneau, and B. Keimer We report a neutron spin-echo study of the critical dynamics in the S = 5 2 antiferromagnets MnF 2 and Rb 2 MnF 4 with three-dimensional (3D) and two-dimensional (2D) spin systems, respectively, in zero external field. Both compounds are Heisenberg antiferromagnets with a small uniaxial anisotropy resultin… [Phys. Rev. B 94, 014424] Published Tue Jul 19, 2016

Schlagwort(e): Magnetism

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Model for multishot all-thermal all-optical switching in ferromagnets (2016)

J. Gorchon, Y. Yang, and J. Bokor

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-20

Beschreibung: Author(s): J. Gorchon, Y. Yang, and J. Bokor All-optical magnetic switching (AOS) is a recently observed rich and puzzling phenomenon that offers promising technological applications. However, a fundamental understanding of the underlying mechanisms remains elusive. Here we present a model for multishot helicity-dependent AOS in ferromagnetic … [Phys. Rev. B 94, 020409(R)] Published Tue Jul 19, 2016

Schlagwort(e): Magnetism

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Intrinsic magnetic properties in R(Fe_{1−x} Co_{x} )_{11} TiZ(R=Yand Ce;Z=H,C,and N) (2016)

Liqin Ke and Duane D. Johnson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-20

Beschreibung: Author(s): Liqin Ke and Duane D. Johnson To guide improved properties coincident with reduction of critical materials in permanent magnets, we investigate via density functional theory (DFT) the intrinsic magnetic properties of a promising system, R ( Fe 1 − x Co x ) 11 Ti Z with R = Y , Ce and interstitial doping ( Z = H , C , N ) . The magnetization M , Curie t… [Phys. Rev. B 94, 024423] Published Tue Jul 19, 2016

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Theory of light-induced effective magnetic field in Rashba ferromagnets (2016)

Alireza Qaiumzadeh and Mikhail Titov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Alireza Qaiumzadeh and Mikhail Titov Motivated by recent experiments on all-optical magnetization reversal in conductive ferromagnetic thin films we use nonequilibrium formalism to calculate the effective magnetic field induced in a Rashba ferromagnet by a short laser pulse. The main contribution to the effect originates in the direct … [Phys. Rev. B 94, 014425] Published Wed Jul 20, 2016

Schlagwort(e): Magnetism

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Magnetoelectric effect in simple collinear antiferromagnetic spinels (2016)

Rana Saha, Somnath Ghara, Emmanuelle Suard, Dong Hyun Jang, Kee Hoon Kim, N. V. Ter-Oganessian, and A. Sundaresan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Rana Saha, Somnath Ghara, Emmanuelle Suard, Dong Hyun Jang, Kee Hoon Kim, N. V. Ter-Oganessian, and A. Sundaresan We report the discovery of the linear magnetoelectric effect in a family of spinel oxides, C o 3 O 4 and Mn B 2 O 4 ( B = Al , Ga ) with simple collinear antiferromagnetic spin structure. An external magnetic field induces a dielectric anomaly at T N , accompanied by the generation of electric polarization that var… [Phys. Rev. B 94, 014428] Published Wed Jul 20, 2016

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Engineering chiral density waves and topological band structures by multiple-Q superpositions of collinear up-up-down-down orders (2016)

Satoru Hayami, Ryo Ozawa, and Yukitoshi Motome

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Satoru Hayami, Ryo Ozawa, and Yukitoshi Motome Magnetic orders characterized by multiple ordering vectors harbor noncollinear and noncoplanar spin textures and can be a source of unusual electronic properties through the spin Berry phase mechanism. We theoretically show that such multiple- Q states are stabilized in itinerant magnets in the form … [Phys. Rev. B 94, 024424] Published Wed Jul 20, 2016

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Thermal spin injection and interface insensitivity in permalloy/aluminum metallic nonlocal spin valves (2016)

A. Hojem, D. Wesenberg, and B. L. Zink

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-22

Beschreibung: Author(s): A. Hojem, D. Wesenberg, and B. L. Zink In a wide range of experiments where electrical currents are used to inject angular momentum, or spin currents, from a metallic ferromagnet into a nonmagnetic metal, the interface plays a critical role. Whether in the giant magnetoresistance effect or in nonlocal spin valves, a loss of spin polarization of an electrical current crossing the interface is seen to reduce the spin current and lead to smaller overall response in sensors. The authors here compare electrical spin injection to the more recently discovered thermal spin injection in a nonlocal spin valve. They show that, despite a strong reduction of electrical spin injection that they tie to the loss of interfacial spin polarization, thermal spin injection remains a large effect. This highlights that thermal spin injection (also called the spin-dependent Seebeck effect) can proceed by new physical mechanisms not possible in the electrically driven case, potentially involving incoherent spin pumping and collective behavior of magnetization in the oxidized interface layer. Better understanding of these interface effects could lead to new ways to increase sensitivity of next-generation magnetic sensors and efficiency of sources of spin current in metallic systems. [Phys. Rev. B 94, 024426] Published Thu Jul 21, 2016

Schlagwort(e): Magnetism

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Interplay between magnetism and energetics in Fe-Cr alloys from a predictive noncollinear magnetic tight-binding model (2016)

R. Soulairol, C. Barreteau, and Chu-Chun Fu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-22

Beschreibung: Author(s): R. Soulairol, C. Barreteau, and Chu-Chun Fu Magnetism is a key driving force controlling several thermodynamic and kinetic properties of Fe-Cr systems. We present a tight-binding model for Fe-Cr, where magnetism is treated beyond the usual collinear approximation. A major advantage of this model consists in a rather simple fitting procedure. … [Phys. Rev. B 94, 024427] Published Thu Jul 21, 2016

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Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn_{2} As_{2} (2016)

V. K. Anand and D. C. Johnston

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): V. K. Anand and D. C. Johnston We report magnetic susceptibility χ , isothermal magnetization M , heat capacity C p , and electrical resistivity ρ measurements on undoped EuMn 2 As 2 and K-doped Eu 0.96 K 0.04 Mn 2 As 2 and Eu 0.93 K 0.07 Mn 2 As 2 single crystals with the trigonal CaAl 2 Si 2 -type structure as a function of temperature T and magnetic f… [Phys. Rev. B 94, 014431] Published Fri Jul 22, 2016

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Thermal expansion and magnetovolume studies of the itinerant helical magnet MnSi (2016)

A. E. Petrova and S. M. Stishov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): A. E. Petrova and S. M. Stishov Thermal expansion and forced magnetostriction of MnSi were measured as a function of temperature down to 5 K and magnetic field to 3 T. The small length (volume) discontinuity at the magnetic phase transition in MnSi decreases with application of magnetic field to a value Δ L / L ∼ 10 − 7 , and then suddenl… [Phys. Rev. B 94, 020410(R)] Published Fri Jul 22, 2016

Schlagwort(e): Magnetism

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Structure and magnetism of cobalt at high pressure and low temperature (2016)

R. Torchio, C. Marini, Y. O. Kvashnin, I. Kantor, O. Mathon, G. Garbarino, C. Meneghini, S. Anzellini, F. Occelli, P. Bruno, A. Dewaele, and S. Pascarelli

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): R. Torchio, C. Marini, Y. O. Kvashnin, I. Kantor, O. Mathon, G. Garbarino, C. Meneghini, S. Anzellini, F. Occelli, P. Bruno, A. Dewaele, and S. Pascarelli The magnetic and structural properties of cobalt were investigated under high pressure (160 GPa) and low temperature (50 K), by synchrotron K-edge x-ray magnetic circular dichroism and x-ray diffraction. A quasihydrostatic equation of state was measured up to 160 GPa. We found that uniaxial stress p… [Phys. Rev. B 94, 024429] Published Fri Jul 22, 2016

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Topology of spin meron pairs in coupled Ni/Fe/Co/Cu(001) disks (2016)

A. Tan, J. Li, A. Scholl, E. Arenholz, A. T. Young, Q. Li, C. Hwang, and Z. Q. Qiu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): A. Tan, J. Li, A. Scholl, E. Arenholz, A. T. Young, Q. Li, C. Hwang, and Z. Q. Qiu The meron is a special topological object that carries only one-half of the topological charge unit. In condensed matter physics, a spin meron corresponds to one-half of a spin skyrmion. As compared to the many fascinating topological properties of skyrmion materials, little is known of the properti… [Phys. Rev. B 94, 014433] Published Mon Jul 25, 2016

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Crystal-field parameters of the rare-earth pyrochlores R_{2} Ti_{2} O_{7} (R=Tb, Dy, and Ho) (2016)

M. Ruminy, E. Pomjakushina, K. Iida, K. Kamazawa, D. T. Adroja, U. Stuhr, and T. Fennell

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): M. Ruminy, E. Pomjakushina, K. Iida, K. Kamazawa, D. T. Adroja, U. Stuhr, and T. Fennell In this work, we present inelastic neutron scattering experiments which probe the single ion ground states of the rare-earth pyrochlores R 2 Ti 2 O 7 ( R = Tb , Dy, Ho). Dy 2 Ti 2 O 7 and Ho 2 Ti 2 O 7 are dipolar spin ices, now often described as hosts of emergent magnetic monopole excitations; the low-temperature st… [Phys. Rev. B 94, 024430] Published Mon Jul 25, 2016

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Tunable spin-wave frequency gap in anisotropy-graded FePt films obtained by ion irradiation (2016)

S. Tacchi, M. G. Pini, A. Rettori, G. Varvaro, A. di Bona, S. Valeri, F. Albertini, P. Lupo, and F. Casoli

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): S. Tacchi, M. G. Pini, A. Rettori, G. Varvaro, A. di Bona, S. Valeri, F. Albertini, P. Lupo, and F. Casoli The effect of graded anisotropy on static and dynamic magnetic properties of Ar + -irradiated FePt films has been investigated by static magnetometry, magnetic force microscopy, and Brillouin light scattering from thermally excited spin waves. A gradual variation of magnetic anisotropy with film thick… [Phys. Rev. B 94, 024432] Published Mon Jul 25, 2016

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Influence of the Dzyaloshinskii-Moriya interaction on the FMR spectrum of magnonic crystals and confined structures (2016)

M. Mruczkiewicz and M. Krawczyk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): M. Mruczkiewicz and M. Krawczyk We study the effect of surface-induced Dzyaloshinskii-Moriya interaction (DMI) on the ferromagnetic resonance (FMR) spectrum of thickness-modulated one-dimensional magnonic crystals and isolated stripes. The DMI is found to substantially increases the intensity of absorption peaks and shifts the fre… [Phys. Rev. B 94, 024434] Published Mon Jul 25, 2016

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Exotic quantum critical point on the surface of three-dimensional topological insulator (2016)

Zhen Bi, Yi-Zhuang You, and Cenke Xu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): Zhen Bi, Yi-Zhuang You, and Cenke Xu In the last few years a lot of exotic and anomalous topological phases were constructed by proliferating the vortexlike topological defects on the surface of the 3 d topological insulator (TI) [Fidkowski et al. , Phys. Rev. X 3 , 041016 (2013) ; Chen et al. , Phys. Rev. B 89 , 165132 (2014) ; Bonderson … [Phys. Rev. B 94, 024433] Published Mon Jul 25, 2016

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Crystal-field states of Kondo lattice heavy fermions CeRuSn_{3} and CeRhSn_{3} (2016)

V. K. Anand, D. T. Adroja, D. Britz, A. M. Strydom, J. W. Taylor, and W. Kockelmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): V. K. Anand, D. T. Adroja, D. Britz, A. M. Strydom, J. W. Taylor, and W. Kockelmann Inelastic neutron scattering experiments have been carried out to determine the crystal-field states of the Kondo lattice heavy fermions CeRuSn 3 and CeRhSn 3 . Both the compounds crystallize in LaRuSn 3 -type cubic structure (space group P m 3 ¯ n ) in which the Ce atoms occupy two distinct crystallographic … [Phys. Rev. B 94, 014440] Published Fri Jul 29, 2016

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μSR insight into the impurity problem in quantum kagome antiferromagnets (2016)

M. Gomilšek, M. Klanjšek, M. Pregelj, H. Luetkens, Y. Li, Q. M. Zhang, and A. Zorko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): M. Gomilšek, M. Klanjšek, M. Pregelj, H. Luetkens, Y. Li, Q. M. Zhang, and A. Zorko Impurities, which are unavoidable in real materials, may play an important role in the magnetism of frustrated spin systems with a spin-liquid ground state. We address the impurity issue in quantum kagome antiferromagnets by investigating ZnCu 3 ( OH ) 6 SO 4 (Zn-brochantite) by means of muon spin spectros… [Phys. Rev. B 94, 024438] Published Fri Jul 29, 2016

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Size dependence of structural stability and magnetization of nickel clusters from real-space pseudopotentials (2016)

Masahiro Sakurai, Jaime Souto-Casares, and James R. Chelikowsky

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): Masahiro Sakurai, Jaime Souto-Casares, and James R. Chelikowsky We examine the structural stability and magnetization for nickel clusters containing up to 500 atoms by performing first-principles calculations based on pseudopotential in real space computed within density-functional theory. After structural relaxation, Ni clusters in this size range favor either … [Phys. Rev. B 94, 024437] Published Fri Jul 29, 2016

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Stress-induced magnetic domain selection reveals a conical ground state for the multiferroic phase of Mn_{2} GeO_{4} (2016)

J. S. White, T. Honda, R. Sibille, N. Gauthier, V. Dmitriev, Th. Strässle, Ch. Niedermayer, T. Kimura, and M. Kenzelmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): J. S. White, T. Honda, R. Sibille, N. Gauthier, V. Dmitriev, Th. Strässle, Ch. Niedermayer, T. Kimura, and M. Kenzelmann At ambient pressure P and below 5.5 K, olivine-type Mn 2 GeO 4 hosts a multiferroic (MF) phase where a multicomponent, i.e., multi- k magnetic order generates spontaneous ferromagnetism and ferroelectricity (FE) along the c axis. Under high P the FE disappears above 6 GPa, yet the P evolution of the mag… [Phys. Rev. B 94, 024439] Published Fri Jul 29, 2016

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Magnons in disordered nonstoichiometric low-dimensional magnets (2016)

Paweł Buczek, Leonid M. Sandratskii, Nadine Buczek, Stefan Thomas, Giovanni Vignale, and Arthur Ernst

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): Paweł Buczek, Leonid M. Sandratskii, Nadine Buczek, Stefan Thomas, Giovanni Vignale, and Arthur Ernst We study spin excitation spectra of one-, two-, and three-dimensional magnets featuring nonmagnetic defects at a wide range of concentrations. Taking the Heisenberg model as the starting point, we tackle the problem by both direct numerical simulations in large supercells and using a semianalytic co… [Phys. Rev. B 94, 054407] Published Tue Aug 02, 2016

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Tailoring transport properties of phase-separated manganite films with ordered magnetic nanostructures (2016)

V. Vlaminck, W. Yánez, J. Hoffman, A. Hoffmann, and D. Niebieskikwiat

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): V. Vlaminck, W. Yánez, J. Hoffman, A. Hoffmann, and D. Niebieskikwiat The magnetotransport properties of thin manganite films ( La 0.7 Ca 0.3 MnO 3 ) coupled with arrays of permalloy (Py) nanodots deposited on the surface of the film are studied as a function of temperature, magnetic field, and the size of the dots. In the presence of the magnetic dots, a reduction of the el… [Phys. Rev. B 94, 064404] Published Tue Aug 02, 2016

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Thermally stable magnetic skyrmions in multilayer synthetic antiferromagnetic racetracks (2016)

Xichao Zhang, Motohiko Ezawa, and Yan Zhou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-04

Beschreibung: Author(s): Xichao Zhang, Motohiko Ezawa, and Yan Zhou A magnetic skyrmion is a topological magnetization structure with a nanometric size and a well-defined swirling spin distribution, which is anticipated to be an essential building block for novel skyrmion-based device applications. We study the motion of magnetic skyrmions in multilayer synthetic an… [Phys. Rev. B 94, 064406] Published Wed Aug 03, 2016

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Giant perpendicular magnetic anisotropy of an individual atom on two-dimensional transition metal dichalcogenides (2016)

Dorj Odkhuu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-05

Beschreibung: Author(s): Dorj Odkhuu Exploring magnetism and magnetic anisotropy in otherwise nonmagnetic two-dimensional materials, such as graphene and transition metal dichalcogenides, is at the heart of spintronics research. Herein, using first-principles calculations we explore the possibility of reaching an atomic-scale perpendic… [Phys. Rev. B 94, 060403(R)] Published Thu Aug 04, 2016

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Magnetostructural coupling, magnetic ordering, and cobalt spin reorientation in metallic Pr_{0.5} Sr_{0.5} CoO_{3} cobaltite (2016)

José Luis García-Muñoz, Jessica Padilla-Pantoja, Xavier Torrelles, Javier Blasco, Javier Herrero-Martín, Bernat Bozzo, and José A. Rodríguez-Velamazán

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): José Luis García-Muñoz, Jessica Padilla-Pantoja, Xavier Torrelles, Javier Blasco, Javier Herrero-Martín, Bernat Bozzo, and José A. Rodríguez-Velamazán In half-doped P r 0.50 A 0.50 Co O 3 metallic perovskites, the spin-lattice coupling brings about distinct magnetostructural transitions for A = Ca and A = Sr at temperatures close to ∼100 K. However, the ground magnetic properties of P r 0.50 S r 0.50 Co O 3 (PSCO) strongly differ from P r 0.50 C a 0.50 Co O 3 ones, where a … [Phys. Rev. B 94, 014411] Published Mon Jul 11, 2016

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Finite-temperature interatomic exchange and magnon softening in Fe overlayers on Ir(001) (2016)

D. C. M. Rodrigues, A. Szilva, A. B. Klautau, A. Bergman, O. Eriksson, and C. Etz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): D. C. M. Rodrigues, A. Szilva, A. B. Klautau, A. Bergman, O. Eriksson, and C. Etz We evaluate how thermal effects soften the magnon dispersion in 6 layers of Fe(001) on top of Ir(001). We perform a systematic study considering noncollinear spin arrangement and calculate configuration-dependent exchange parameters J i j n c following the methodology described by Szilva et al. [ Phys. … [Phys. Rev. B 94, 014413] Published Mon Jul 11, 2016

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Tuning the magnetocrystalline anisotropy in RCoPO by means of R substitution: A ferromagnetic resonance study (2016)

G. Prando, A. Alfonsov, A. Pal, V. P. S. Awana, B. Büchner, and V. Kataev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): G. Prando, A. Alfonsov, A. Pal, V. P. S. Awana, B. Büchner, and V. Kataev We report on broad-band electron-spin resonance measurements performed within the itinerant ferromagnetic phase of R CoPO ( R = La, Pr, Nd, and Sm). We reveal that the R substitution is highly effective in gradually introducing a sizable easy-plane magnetocrystalline anisotropy within the Co sublattic… [Phys. Rev. B 94, 024412] Published Mon Jul 11, 2016

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Spin pumping damping and magnetic proximity effect in Pd and Pt spin-sink layers (2016)

M. Caminale, A. Ghosh, S. Auffret, U. Ebels, K. Ollefs, F. Wilhelm, A. Rogalev, and W. E. Bailey

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-13

Beschreibung: Author(s): M. Caminale, A. Ghosh, S. Auffret, U. Ebels, K. Ollefs, F. Wilhelm, A. Rogalev, and W. E. Bailey Ultrathin films of the heavy elements Pd and Pt are widely used in spintronics as converters between charge and spin currents and vice versa. One open question has been whether the strongly paramagnetic nature of these elements influences the interconversion process. The authors show, using a combination of ferromagnetic resonance and x-ray magnetic circular dichroism measurements, that a related spin current absorption process (spin pumping damping) responds to the presence of ferromagnetic order in the polarizable Pd and Pt layers. They observe a change in the thickness dependence of spin current absorption when the Pd and Pt layers are in direct contact with a ferromagnet, compared with when they are in indirect contact. This change correlates with the presence of induced magnetic moments in Pd and Pt as revealed by element-specific x-ray magnetic circular dichroism magnetometry. The results show that the decoherence process for spin current in such layers is not independent of geometry, but rather is influenced by the presence of induced ferromagnetic order. [Phys. Rev. B 94, 014414] Published Tue Jul 12, 2016

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Strong enhancement of spin ordering by A-site magnetic ions in the ferrimagnet CaCu_{3} Fe_{2} Os_{2} O_{12} (2016)

Hongshan Deng, Min Liu, Jianhong Dai, Zhiwei Hu, Changyang Kuo, Yunyu Yin, Junye Yang, Xiao Wang, Qing Zhao, Yuanji Xu, Zhaoming Fu, Jianwang Cai, Haizhong Guo, Kuijuan Jin, Tunwen Pi, Yunliang Soo, Guanghui Zhou, Jinguang Cheng, Kai Chen, Philippe Ohresser, Yi-feng Yang, Changqing Jin, Liu-Hao Tjeng, and Youwen Long

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-13

Beschreibung: Author(s): Hongshan Deng, Min Liu, Jianhong Dai, Zhiwei Hu, Changyang Kuo, Yunyu Yin, Junye Yang, Xiao Wang, Qing Zhao, Yuanji Xu, Zhaoming Fu, Jianwang Cai, Haizhong Guo, Kuijuan Jin, Tunwen Pi, Yunliang Soo, Guanghui Zhou, Jinguang Cheng, Kai Chen, Philippe Ohresser, Yi-feng Yang, Changqing Jin, Liu-Hao Tjeng, and Youwen Long A B O 3 perovskite is a kind of very important functional material with versatile physical properties. Although B -site chemical substitution with various magnetic ions has been widely investigated, the A -site doping with magnetic transition metal is little known. Here we report A A 3 ′ B 2 B 2 ′ O 12 -type A - and… [Phys. Rev. B 94, 024414] Published Tue Jul 12, 2016

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Crystal structure and partial Ising-like magnetic ordering of orthorhombic Dy_{2} TiO_{5} (2016)

Jacob Shamblin, Stuart Calder, Zhiling Dun, Minseong Lee, Eun Sang Choi, Joerg Neuefeind, Haidong Zhou, and Maik Lang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-13

Beschreibung: Author(s): Jacob Shamblin, Stuart Calder, Zhiling Dun, Minseong Lee, Eun Sang Choi, Joerg Neuefeind, Haidong Zhou, and Maik Lang The structure and magnetic properties of orthorhombic D y 2 Ti O 5 have been investigated using x-ray diffraction, neutron diffraction, and alternating current (ac)/direct current (dc) magnetic susceptibility measurements. We report a continuous structural distortion below 100 K characterized by negative… [Phys. Rev. B 94, 024413] Published Tue Jul 12, 2016

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Short-range magnetic correlations and spin dynamics in the paramagnetic regime of (Mn,Fe)_{2} (P,Si) (2016)

X. F. Miao, L. Caron, J. Cedervall, P. C. M. Gubbens, P. Dalmas de Réotier, A. Yaouanc, F. Qian, A. R. Wildes, H. Luetkens, A. Amato, N. H. van Dijk, and E. Brück

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): X. F. Miao, L. Caron, J. Cedervall, P. C. M. Gubbens, P. Dalmas de Réotier, A. Yaouanc, F. Qian, A. R. Wildes, H. Luetkens, A. Amato, N. H. van Dijk, and E. Brück The spatial and temporal correlations of magnetic moments in the paramagnetic regime of ( Mn , Fe ) 2 ( P , Si ) have been investigated by means of polarized neutron diffraction and muon-spin relaxation techniques. Short-range magnetic correlations are present at temperatures far above the ferromagnetic trans… [Phys. Rev. B 94, 014426] Published Wed Jul 20, 2016

Schlagwort(e): Magnetism

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Spin Seebeck effect through antiferromagnetic NiO (2016)

Arati Prakash, Jack Brangham, Fengyuan Yang, and Joseph P. Heremans

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Arati Prakash, Jack Brangham, Fengyuan Yang, and Joseph P. Heremans We report temperature-dependent spin Seebeck measurements on Pt/YIG bilayers and Pt/NiO/YIG trilayers, where YIG (yttrium iron garnet, Y 3 F e 5 O 12 ) is an insulating ferrimagnet and NiO is an antiferromagnet at low temperatures. The thickness of the NiO layer is varied from 0 to 10 nm. In the Pt/YIG bil… [Phys. Rev. B 94, 014427] Published Wed Jul 20, 2016

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Characteristic dynamic modes and domain-wall motion in magnetic nanotubes excited by resonant rotating magnetic fields (2016)

Jaehak Yang, Junhoe Kim, Bosung Kim, Young-Jun Cho, Jae-Hyeok Lee, and Sang-Koog Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Jaehak Yang, Junhoe Kim, Bosung Kim, Young-Jun Cho, Jae-Hyeok Lee, and Sang-Koog Kim We performed micromagnetic numerical calculations to explore a cylindrical nanotube's magnetization dynamics and domain-wall (DW) motions driven by eigen-circular-rotating magnetic fields of different frequencies. We discovered the presence of two different localized DW oscillations as well as asymm… [Phys. Rev. B 94, 024425] Published Wed Jul 20, 2016

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Resonant optical control of the structural distortions that drive ultrafast demagnetization in Cr_{2} O_{3} (2016)

V. G. Sala, S. Dal Conte, T. A. Miller, D. Viola, E. Luppi, V. Véniard, G. Cerullo, and S. Wall

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): V. G. Sala, S. Dal Conte, T. A. Miller, D. Viola, E. Luppi, V. Véniard, G. Cerullo, and S. Wall We study how the color and polarization of ultrashort pulses of visible light can be used to control the demagnetization processes of the antiferromagnetic insulator Cr 2 O 3 . We utilize time-resolved second harmonic generation (SHG) to probe how changes in the magnetic and structural state evolve in t… [Phys. Rev. B 94, 014430] Published Fri Jul 22, 2016

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Anomalous Hall effect in Fe/Au multilayers (2016)

Q. Zhang, P. Li, Y. Wen, C. Zhao, J. W. Zhang, A. Manchon, W. B. Mi, Y. Peng, and X. X. Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): Q. Zhang, P. Li, Y. Wen, C. Zhao, J. W. Zhang, A. Manchon, W. B. Mi, Y. Peng, and X. X. Zhang To understand the interfacial scattering effect on the anomalous Hall effect (AHE), we prepared multilayers of ( F e ( 36 / n ) nm / A u ( 12 / n ) nm ) n using an e-beam evaporator. This structure design allowed us to investigate the effect of interfacial scattering on the AHE, while keeping the samples' thickness an… [Phys. Rev. B 94, 024428] Published Fri Jul 22, 2016

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Domain wall in a quantum anomalous Hall insulator as a magnetoelectric piston (2016)

Pramey Upadhyaya and Yaroslav Tserkovnyak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): Pramey Upadhyaya and Yaroslav Tserkovnyak We theoretically study the magnetoelectric coupling in a quantum anomalous Hall insulator state induced by interfacing a dynamic magnetization texture to a topological insulator. In particular, we propose that the quantum anomalous Hall insulator with a magnetic configuration of a domain wall, when … [Phys. Rev. B 94, 020411(R)] Published Mon Jul 25, 2016

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Topological spin-transfer drag driven by skyrmion diffusion (2016)

Héctor Ochoa, Se Kwon Kim, and Yaroslav Tserkovnyak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): Héctor Ochoa, Se Kwon Kim, and Yaroslav Tserkovnyak We study the spin-transfer drag mediated by the Brownian motion of skyrmions. The essential idea is illustrated in a two-terminal geometry, in which a thin film of a magnetic insulator is placed in between two metallic reservoirs. An electric current in one of the terminals pumps topological charge … [Phys. Rev. B 94, 024431] Published Mon Jul 25, 2016

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Time evolution of domain-wall motion induced by nanosecond laser pulses (2016)

M. V. Gerasimov, M. V. Logunov, A. V. Spirin, Yu. N. Nozdrin, and I. D. Tokman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-27

Beschreibung: Author(s): M. V. Gerasimov, M. V. Logunov, A. V. Spirin, Yu. N. Nozdrin, and I. D. Tokman The time evolution of the magnetization normal component change in a garnet film with a labyrinthine domain structure under the action of circularly and linearly polarized laser pump pulses (the pulse duration is 5 ns; the wavelength is 527 nm) has been studied. The dynamic state of the magnetic fil… [Phys. Rev. B 94, 014434] Published Tue Jul 26, 2016

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Candidate quantum spin ice in the pyrochlore Pr_{2} Hf_{2} O_{7} (2016)

Romain Sibille, Elsa Lhotel, Monica Ciomaga Hatnean, Geetha Balakrishnan, Björn Fåk, Nicolas Gauthier, Tom Fennell, and Michel Kenzelmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-28

Beschreibung: Author(s): Romain Sibille, Elsa Lhotel, Monica Ciomaga Hatnean, Geetha Balakrishnan, Björn Fåk, Nicolas Gauthier, Tom Fennell, and Michel Kenzelmann We report the low temperature magnetic properties of the pyrochlore Pr 2 Hf 2 O 7 . Polycrystalline and single-crystal samples are investigated using time-of-flight neutron spectroscopy and macroscopic measurements, respectively. The crystal-field splitting produces a non-Kramers doublet ground state for … [Phys. Rev. B 94, 024436] Published Wed Jul 27, 2016

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Localized domain wall nucleation dynamics in asymmetric ferromagnetic rings revealed by direct time-resolved magnetic imaging (2016)

Kornel Richter, Andrea Krone, Mohamad-Assaad Mawass, Benjamin Krüger, Markus Weigand, Hermann Stoll, Gisela Schütz, and Mathias Kläui

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-28

Beschreibung: Author(s): Kornel Richter, Andrea Krone, Mohamad-Assaad Mawass, Benjamin Krüger, Markus Weigand, Hermann Stoll, Gisela Schütz, and Mathias Kläui We report time-resolved observations of field-induced domain wall nucleation in asymmetric ferromagnetic rings using single direction field pulses and rotating fields. We show that the asymmetric geometry of a ring allows for controlling the position of nucleation events, when a domain wall is nucle… [Phys. Rev. B 94, 024435] Published Wed Jul 27, 2016

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Mechanical back-action of a spin-wave resonance in a magnetoelastic thin film on a surface acoustic wave (2016)

P. G. Gowtham, D. Labanowski, and S. Salahuddin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-28

Beschreibung: Author(s): P. G. Gowtham, D. Labanowski, and S. Salahuddin Surface acoustic waves (SAWs) traveling on the surface of a piezoelectric crystal can, through the magnetoelastic interaction, excite traveling spin-wave resonance in a magnetic film deposited on the substrate. This spin-wave resonance in the magnetic film creates a time-ynamic surface stress of mag… [Phys. Rev. B 94, 014436] Published Wed Jul 27, 2016

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Magnetic, resonance, and optical properties of Cu_{3} Sm(SeO_{3} )_{2} O_{2} Cl: A rare-earth francisite compound (2016)

K. V. Zakharov, E. A. Zvereva, M. M. Markina, M. I. Stratan, E. S. Kuznetsova, S. F. Dunaev, P. S. Berdonosov, V. A. Dolgikh, A. V. Olenev, S. A. Klimin, L. S. Mazaev, M. A. Kashchenko, Md. A. Ahmed, A. Banerjee, S. Bandyopadhyay, A. Iqbal, B. Rahaman, T. Saha-Dasgupta, and A. N. Vasiliev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): K. V. Zakharov, E. A. Zvereva, M. M. Markina, M. I. Stratan, E. S. Kuznetsova, S. F. Dunaev, P. S. Berdonosov, V. A. Dolgikh, A. V. Olenev, S. A. Klimin, L. S. Mazaev, M. A. Kashchenko, Md. A. Ahmed, A. Banerjee, S. Bandyopadhyay, A. Iqbal, B. Rahaman, T. Saha-Dasgupta, and A. N. Vasiliev In this combined experimental and theoretical paper, we study the properties of Cu 3 Sm ( SeO 3 ) 2 O 2 Cl belonging to the francisite family of compounds, which are novel frustrated layered compounds. Cu 3 Sm ( SeO 3 ) 2 O 2 Cl is synthesized through a solid state reaction. Characterizations through measurements of ma… [Phys. Rev. B 94, 054401] Published Mon Aug 01, 2016

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Spin dynamical phase and antiresonance in a strongly coupled magnon-photon system (2016)

Michael Harder, Paul Hyde, Lihui Bai, Christophe Match, and Can-Ming Hu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Michael Harder, Paul Hyde, Lihui Bai, Christophe Match, and Can-Ming Hu We experimentally studied a strongly coupled magnon-photon system via microwave transmission measurements. An antiresonance, i.e., the suppression of the microwave transmission, is observed, indicating a relative phase change between the magnon response and the driving microwave field. We show that … [Phys. Rev. B 94, 054403] Published Mon Aug 01, 2016

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Thickness dependence of exchange coupling in epitaxial Fe_{3} O_{4} /CoFe_{2} O_{4} soft/hard magnetic bilayers (2016)

G. Lavorato, E. Winkler, B. Rivas-Murias, and F. Rivadulla

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): G. Lavorato, E. Winkler, B. Rivas-Murias, and F. Rivadulla Epitaxial magnetic heterostructures of ( soft − ) Fe 3 O 4 / ( hard − ) CoFe 2 O 4 ( 001 ) have been fabricated with a varying thicknesses of soft ferrite from 5 to 25 nm. We report a change in the regime of magnetic interaction between the layers from rigid-coupling to exchange-spring behavior, above a critical thick… [Phys. Rev. B 94, 054405] Published Mon Aug 01, 2016

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Skyrmions in square-lattice antiferromagnets (2016)

Rick Keesman, Mark Raaijmakers, A. E. Baerends, G. T. Barkema, and R. A. Duine

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Rick Keesman, Mark Raaijmakers, A. E. Baerends, G. T. Barkema, and R. A. Duine The ground states of square-lattice two-dimensional antiferromagnets with anisotropy in an external magnetic field are determined using Monte Carlo simulations and compared to theoretical analysis. We find a phase in between the spin-flop and spiral phase that shows strong similarity to skyrmions in… [Phys. Rev. B 94, 054402] Published Mon Aug 01, 2016

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Magnetic anisotropy in the frustrated spin-chain compound β−TeVO_{4} (2016)

F. Weickert, N. Harrison, B. L. Scott, M. Jaime, A. Leitmäe, I. Heinmaa, R. Stern, O. Janson, H. Berger, H. Rosner, and A. A. Tsirlin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): F. Weickert, N. Harrison, B. L. Scott, M. Jaime, A. Leitmäe, I. Heinmaa, R. Stern, O. Janson, H. Berger, H. Rosner, and A. A. Tsirlin Isotropic and anisotropic magnetic behavior of the frustrated spin-chain compound β − TeVO 4 is reported. Three magnetic transitions observed in zero magnetic field are tracked in fields applied along different crystallographic directions using magnetization, heat capacity, and magnetostriction measure… [Phys. Rev. B 94, 064403] Published Mon Aug 01, 2016

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Modulated systems in external fields: Conditions for the presence of reentrant phase diagrams (2016)

Alejandro Mendoza-Coto, Orlando V. Billoni, Sergio A. Cannas, and Daniel A. Stariolo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Alejandro Mendoza-Coto, Orlando V. Billoni, Sergio A. Cannas, and Daniel A. Stariolo We introduce a coarse-grained model capable of describing the phase behavior of two-dimensional ferromagnetic systems with competing exchange and dipolar interactions, as well as an external magnetic field. An improved expression for the mean-field entropic contribution allows us to compute the phas… [Phys. Rev. B 94, 054404] Published Mon Aug 01, 2016

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Energetic molding of chiral magnetic bubbles (2016)

Derek Lau, Vignesh Sundar, Jian-Gang Zhu, and Vincent Sokalski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Derek Lau, Vignesh Sundar, Jian-Gang Zhu, and Vincent Sokalski Unique spin configurations in thin films, including skyrmions and chiral domain walls, present fascinating physical questions while also promising future, low-energy computing systems. The emergent interfacial Dzyaloshinskii-Moriya interaction (DMI), which stabilizes these features, greatly changes the energetic and symmetry-based arguments by which magnetic domains have previously been described. The authors here analyze the behavior of magnetic bubbles in thin films influenced by DMI using classical interface thermodynamics via the Wulff construction, originally conceived to describe crystal facets more than 100 years ago. The striking resemblance of experimentally observed domain shapes to those predicted theoretically suggests that a significant energetic driving force for domain growth exists due to an anisotropic wall energy term from the interfacial DMI. This description explains the observed reversal in growth symmetry found here in Co/Ni multilayer films while presenting a new paradigm for describing the broader behavior of chiral domain walls. [Phys. Rev. B 94, 060401(R)] Published Mon Aug 01, 2016

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Itinerant G-type antiferromagnetism in D0_{3} -type V_{3} Z (Z=Al, Ga, In) compounds: A first-principles study (2016)

Iosif Galanakis, Şaban Tırpancı, Kemal Özdoğan, and Ersoy Şaşıoğlu

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Iosif Galanakis, Şaban Tırpancı, Kemal Özdoğan, and Ersoy Şaşıoğlu Heusler compounds are widely studied due to their variety of magnetic properties making them ideal candidates for spintronic and magnetoelectronic applications. V 3 Al in its metastable D 0 3 -type Heusler structure is a prototype for a rare antiferromagnetic gapless behavior. We provide an extensive stu… [Phys. Rev. B 94, 064401] Published Mon Aug 01, 2016

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Antiferromagnet-induced perpendicular magnetic anisotropy in ferromagnetic/antiferromagnetic/ferromagnetic trilayers (2016)

Bo-Yao Wang, Po-Han Lin, Ming-Shian Tsai, Chun-Wei Shih, Meng-Ju Lee, Chun-Wei Huang, Nae-Yeou Jih, and Der-Hsin Wei

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Bo-Yao Wang, Po-Han Lin, Ming-Shian Tsai, Chun-Wei Shih, Meng-Ju Lee, Chun-Wei Huang, Nae-Yeou Jih, and Der-Hsin Wei This study demonstrates the effect of antiferromagnet-induced perpendicular magnetic anisotropy (PMA) on ferromagnetic/antiferromagnetic/ferromagnetic (FM/AFM/FM) trilayers and reveals its interplay with a long-range interlayer coupling between separated FM layers. In epitaxially grown 12 monolayer … [Phys. Rev. B 94, 064402] Published Mon Aug 01, 2016

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Correlations of crystallographic defects and anisotropy with magnetotransport properties in Fe_{x} TaS_{2} single crystals (0.23≤x≤0.35) (2016)

Chih-Wei Chen, Shalinee Chikara, Vivien S. Zapf, and E. Morosan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): Chih-Wei Chen, Shalinee Chikara, Vivien S. Zapf, and E. Morosan Very large magnetoresistance discovered in single crystals of the ferromagnetic Fe-intercalated transition-metal dichalcogenide Fe 0.28 TaS 2 was attributed to the deviation of the Fe concentration from commensurate values ( x = 1 / 4 or 1/3), which caused magnetic moment misalignments. Here we report a stu… [Phys. Rev. B 94, 054406] Published Tue Aug 02, 2016

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Direct observation of magnetization dynamics generated by nanocontact spin-torque vortex oscillators (2016)

P. S. Keatley, S. R. Sani, G. Hrkac, S. M. Mohseni, P. Dürrenfeld, T. H. J. Loughran, J. Åkerman, and R. J. Hicken

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): P. S. Keatley, S. R. Sani, G. Hrkac, S. M. Mohseni, P. Dürrenfeld, T. H. J. Loughran, J. Åkerman, and R. J. Hicken Time-resolved scanning Kerr microscopy has been used to directly image the magnetization dynamics of nanocontact (NC) spin-torque vortex oscillators (STVOs) when phase locked to an injected microwave (rf) current. The Kerr images reveal free-layer magnetization dynamics that extend outside the NC fo… [Phys. Rev. B 94, 060402(R)] Published Tue Aug 02, 2016

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Random SU(2)-symmetric spin-S chains (2016)

V. L. Quito, José A. Hoyos, and E. Miranda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-04

Beschreibung: Author(s): V. L. Quito, José A. Hoyos, and E. Miranda We study the low-energy physics of a broad class of time-reversal invariant and SU(2)-symmetric one-dimensional spin- S systems in the presence of quenched disorder via a strong-disorder renormalization-group technique. We show that, in general, there is an antiferromagnetic phase with an emergent SU … [Phys. Rev. B 94, 064405] Published Wed Aug 03, 2016

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Skyrmion domain wall collision and domain wall-gated skyrmion logic (2016)

Xiangjun Xing, Philip W. T. Pong, and Yan Zhou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-05

Beschreibung: Author(s): Xiangjun Xing, Philip W. T. Pong, and Yan Zhou Skyrmions and domain walls are significant spin textures of great technological relevance to magnetic memory and logic applications, where they can be used as carriers of information. The unique topology of skyrmions makes them display emergent dynamical properties as compared with domain walls. Som… [Phys. Rev. B 94, 054408] Published Thu Aug 04, 2016

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Spin-transfer torques in antiferromagnetic textures: Efficiency and quantification method (2016)

Yuta Yamane, Jun'ichi Ieda, and Jairo Sinova

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-06

Beschreibung: Author(s): Yuta Yamane, Jun'ichi Ieda, and Jairo Sinova We formulate a theory of spin-transfer torques in textured antiferromagnets, which covers the small to large limits of the exchange coupling energy relative to the kinetic energy of the intersublattice electron dynamics. Our theory suggests a natural definition of the efficiency of spin-transfer tor… [Phys. Rev. B 94, 054409] Published Fri Aug 05, 2016

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Structural and magnetic field effects on spin fluctuations in Sr_{3} Ru_{2} O_{7} (2016)

Shantanu Mukherjee and Wei-Cheng Lee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-08-06

Beschreibung: Author(s): Shantanu Mukherjee and Wei-Cheng Lee We investigate the evolution of magnetic excitations in Sr 3 Ru 2 O 7 in the paramagnetic metallic phase using a three-band tight-binding model. The effect of Mn or Ti dopant ions on the Sr 3 Ru 2 O 7 band structure has been included by taking into account the dopant-induced suppression of the oxygen octahedr… [Phys. Rev. B 94, 064407] Published Fri Aug 05, 2016

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Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state of Pr_{0.5} Ca_{0.5} MnO_{3} (2016)

R. A. Ewings, T. G. Perring, O. Sikora, D. L. Abernathy, Y. Tomioka, and Y. Tokura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): R. A. Ewings, T. G. Perring, O. Sikora, D. L. Abernathy, Y. Tomioka, and Y. Tokura We have used time-of-flight inelastic neutron scattering to measure the spin wave spectrum of the canonical half-doped manganite Pr 0.5 Ca 0.5 MnO 3 in its magnetic and orbitally ordered phase. The data, which cover multiple Brillouin zones and the entire energy range of the excitations, are compared wit… [Phys. Rev. B 94, 014405] Published Wed Jul 06, 2016

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Skyrmion dynamics under uniaxial anisotropy (2016)

D. Ehlers, I. Stasinopoulos, V. Tsurkan, H.-A. Krug von Nidda, T. Fehér, A. Leonov, I. Kézsmárki, D. Grundler, and A. Loidl

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): D. Ehlers, I. Stasinopoulos, V. Tsurkan, H.-A. Krug von Nidda, T. Fehér, A. Leonov, I. Kézsmárki, D. Grundler, and A. Loidl Broadband microwave spectroscopy has been performed on single-crystalline GaV 4 S 8 , which exhibits a complex magnetic phase diagram including cycloidal and Néel-type skyrmion lattice phases below 13 K. At small magnetic fields two collective modes with large frequency separation are found that reflect… [Phys. Rev. B 94, 014406] Published Wed Jul 06, 2016

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X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations (2016)

J. P. Clancy, H. Gretarsson, E. K. H. Lee, Di Tian, J. Kim, M. H. Upton, D. Casa, T. Gog, Z. Islam, Byung-Gu Jeon, Kee Hoon Kim, S. Desgreniers, Yong Baek Kim, S. J. Julian, and Young-June Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): J. P. Clancy, H. Gretarsson, E. K. H. Lee, Di Tian, J. Kim, M. H. Upton, D. Casa, T. Gog, Z. Islam, Byung-Gu Jeon, Kee Hoon Kim, S. Desgreniers, Yong Baek Kim, S. J. Julian, and Young-June Kim We have investigated the structural, electronic, and magnetic properties of the pyrochlore iridates Eu 2 Ir 2 O 7 and Pr 2 Ir 2 O 7 using a combination of resonant elastic x-ray scattering, x-ray powder diffraction, and resonant inelastic x-ray scattering (RIXS). The structural parameters of Eu 2 Ir 2 O 7 have bee… [Phys. Rev. B 94, 024408] Published Wed Jul 06, 2016

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Lorentz microscopy and small-angle electron diffraction study of magnetic textures in La_{1−x} Sr_{x} MnO_{3} (0.15〈x〈0.30): The role of magnetic anisotropy (2016)

A. Kotani, H. Nakajima, K. Harada, Y. Ishii, and S. Mori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): A. Kotani, H. Nakajima, K. Harada, Y. Ishii, and S. Mori Magnetic textures in the ferromagnetic phases of L a 1 − x S r x Mn O 3 for 0.15 〈 x 〈 0.30 have been investigated by Lorentz microscopy combined with small-angle electron diffraction experiments. Various types of magnetic textures characterized by stripe, plate-shaped, and cylindrical (magnetic bubble) dom… [Phys. Rev. B 94, 024407] Published Wed Jul 06, 2016

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Highly anisotropic exchange interactions of j_{eff} =1/2 iridium moments on the fcc lattice in La_{2} BIrO_{6} (B=Mg,Zn) (2016)

A. A. Aczel, A. M. Cook, T. J. Williams, S. Calder, A. D. Christianson, G.-X. Cao, D. Mandrus, Yong-Baek Kim, and A. Paramekanti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): A. A. Aczel, A. M. Cook, T. J. Williams, S. Calder, A. D. Christianson, G.-X. Cao, D. Mandrus, Yong-Baek Kim, and A. Paramekanti A special type of anisotropic spin exchange called the “Kitaev interaction” provides rare exactly-soluble models of gapless quantum spin liquids in 2d and 3d. The main goals of this work were to identify other lattice geometries that support the elusive Kitaev interactions and understand the magnetic properties of such materials. By performing inelastic neutron scattering on La 2 MgIrO 6 and La 2 ZnIrO 6 , the authors find that these magnets, which possess long-range antiferromagnetic order, yield clear signatures of gapped and nearly-dispersionless magnon excitations. They also show that spin-wave models with a dominant Kitaev interaction can naturally account for the magnetic ordering pattern as well as the inelastic neutron scattering data. [Phys. Rev. B 93, 214426] Published Mon Jun 20, 2016

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Interpreting current-induced spin polarization in topological insulator surface states (2016)

Pengke Li (李鹏科) and Ian Appelbaum

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): Pengke Li (李鹏科) and Ian Appelbaum Several recent experiments on three-dimensional topological insulators claim to observe a large charge current-induced nonequilibrium ensemble spin polarization of electrons in the helical surface state. We present a comprehensive criticism of such claims, using both theory and experiment: First, we… [Phys. Rev. B 93, 220404(R)] Published Mon Jun 20, 2016

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Tunable crossover between one- and three-dimensional magnetic dynamics in Co^{II} single-chain magnets organized by halogen bonding (2016)

A. Amjad, J. M. Clemente-Juan, E. Coronado, F. Luis, M. Evangelisti, G. Mínguez Espallargas, and E. del Barco

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): A. Amjad, J. M. Clemente-Juan, E. Coronado, F. Luis, M. Evangelisti, G. Mínguez Espallargas, and E. del Barco Low-temperature magnetometry, ac susceptibility, and calorimetry have been employed to study Co-based single-chain magnets (SCMs) organized through halogen bonding. Magnetic hysteresis and maxima in the dc and ac susceptibilities, respectively, confirm the SCM behavior of the system. Several charact… [Phys. Rev. B 93, 224418] Published Mon Jun 20, 2016

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Spin-orbit torques and spin accumulation in FePt/Pt and Co/Cu thin films from first principles: The role of impurities (2016)

Guillaume Géranton, Bernd Zimmermann, Nguyen H. Long, Phivos Mavropoulos, Stefan Blügel, Frank Freimuth, and Yuriy Mokrousov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Guillaume Géranton, Bernd Zimmermann, Nguyen H. Long, Phivos Mavropoulos, Stefan Blügel, Frank Freimuth, and Yuriy Mokrousov Using the Boltzmann formalism based on the first principles electronic structure and scattering rates, we investigate the current-induced spin accumulation and spin-orbit torques in FePt/Pt and Co/Cu bilayers in the presence of substitutional impurities. In FePt/Pt bilayers we consider the effect of… [Phys. Rev. B 93, 224420] Published Tue Jun 21, 2016

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Critical behavior of the two-dimensional Ising model with long-range correlated disorder (2016)

M. Dudka, A. A. Fedorenko, V. Blavatska, and Yu. Holovatch

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-24

Beschreibung: Author(s): M. Dudka, A. A. Fedorenko, V. Blavatska, and Yu. Holovatch We study critical behavior of the diluted two-dimensional Ising model in the presence of disorder correlations which decay algebraically with distance as ∼ r − a . Mapping the problem onto two-dimensional Dirac fermions with correlated disorder we calculate the critical properties using renormalization … [Phys. Rev. B 93, 224422] Published Wed Jun 22, 2016

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Strong spin Hall effect in the antiferromagnet PtMn (2016)

Yongxi Ou, Shengjie Shi, D. C. Ralph, and R. A. Buhrman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): Yongxi Ou, Shengjie Shi, D. C. Ralph, and R. A. Buhrman Effectively manipulating magnetism in ferromagnet (FM) thin-film nanostructures with an in-plane current has become feasible since the determination of a “giant” spin Hall effect (SHE) in certain heavy metal/FM systems. Recently, both theoretical and experimental reports indicate that metallic antif… [Phys. Rev. B 93, 220405(R)] Published Mon Jun 20, 2016

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Energy dynamics in the Heisenberg-Kitaev spin chain (2016)

Robin Steinigeweg and Wolfram Brenig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): Robin Steinigeweg and Wolfram Brenig We study the Heisenberg-Kitaev spin chain in order to uncover the interplay between two qualitatively different integrable points in the physics of heat transport in one dimension. Focusing on high temperatures and using analytical as well as numerical approaches within linear response theory, we ex… [Phys. Rev. B 93, 214425] Published Mon Jun 20, 2016

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Enhanced Faraday rotation by crystals of core-shell magnetoplasmonic nanoparticles (2016)

P. Varytis, P. A. Pantazopoulos, and N. Stefanou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): P. Varytis, P. A. Pantazopoulos, and N. Stefanou Collective hybridized plasmon modes, which enable strong magnetooptical coupling and consequent enhanced Faraday effect in three-dimensional periodic assemblies of magnetic dielectric nanoparticles coated with a noble-metal shell, are studied by means of rigorous full electrodynamic calculations usi… [Phys. Rev. B 93, 214423] Published Mon Jun 20, 2016

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Influence of the critical Fe atomic volume on the magnetism of Fe-rich metallic glasses evidenced by pressure-dependent measurements (2016)

L. F. Kiss, T. Kemény, J. Bednarčík, J. Gamcová, and H.-P. Liermann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): L. F. Kiss, T. Kemény, J. Bednarčík, J. Gamcová, and H.-P. Liermann Despite the intensive studies for decades, it is still not well understood how qualitatively different magnetic behaviors can occur in a narrow composition range for the Fe-rich Fe-transition metal ( TM ) amorphous alloys. In this study of amorphous F e 100 − x Z r x ( x = 7 , 9, 12) metallic glasses, normal fer… [Phys. Rev. B 93, 214424] Published Mon Jun 20, 2016

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Interface-driven spin-torque ferromagnetic resonance by Rashba coupling at the interface between nonmagnetic materials (2016)

M. B. Jungfleisch, W. Zhang, J. Sklenar, W. Jiang, J. E. Pearson, J. B. Ketterson, and A. Hoffmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): M. B. Jungfleisch, W. Zhang, J. Sklenar, W. Jiang, J. E. Pearson, J. B. Ketterson, and A. Hoffmann The Rashba-Edelstein effect stems from the interaction between the electron's spin and its momentum induced by spin-orbit interaction at an interface or a surface. It was shown that the inverse Rashba-Edelstein effect can be used to convert a spin current into a charge current. Here, we demonstrate … [Phys. Rev. B 93, 224419] Published Mon Jun 20, 2016

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Dynamic modulation of the transport properties of the LaAlO_{3} /SrTiO_{3} interface using uniaxial strain (2016)

Fan Zhang, Yue-Wen Fang, Ngai Yui Chan, Wing Chong Lo, Dan Feng Li, Chun-Gang Duan, Feng Ding, and Ji Yan Dai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Fan Zhang, Yue-Wen Fang, Ngai Yui Chan, Wing Chong Lo, Dan Feng Li, Chun-Gang Duan, Feng Ding, and Ji Yan Dai Among the interfacial transport modulations to the LaAl O 3 / SrTi O 3 (LAO/STO) heterostructure, mechanical strain has been proven to be an effective approach by growing the LAO/STO films on different substrates with varying lattice mismatches to STO. However, this lattice-mismatch-induced strain effect … [Phys. Rev. B 93, 214427] Published Tue Jun 21, 2016

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Phenomenology of chiral damping in noncentrosymmetric magnets (2016)

Collins Ashu Akosa, Ioan Mihai Miron, Gilles Gaudin, and Aurélien Manchon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Collins Ashu Akosa, Ioan Mihai Miron, Gilles Gaudin, and Aurélien Manchon A phenomenology of magnetic chiral damping is proposed in the context of magnetic materials lacking inversion symmetry. We show that the magnetic damping tensor acquires a component linear in magnetization gradient in the form of Lifshitz invariants. We propose different microscopic mechanisms that … [Phys. Rev. B 93, 214429] Published Tue Jun 21, 2016

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Spin-wave and electromagnon dispersions in multiferroic MnWO_{4} as observed by neutron spectroscopy: Isotropic Heisenberg exchange versus anisotropic Dzyaloshinskii-Moriya interaction (2016)

Y. Xiao (肖荫果), C. M. N. Kumar, S. Nandi, Y. Su (苏夷希), W. T. Jin (金文涛), Z. Fu (付振东), E. Faulhaber, A. Schneidewind, and Th. Brückel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Y. Xiao (肖荫果), C. M. N. Kumar, S. Nandi, Y. Su (苏夷希), W. T. Jin (金文涛), Z. Fu (付振东), E. Faulhaber, A. Schneidewind, and Th. Brückel High-resolution inelastic neutron scattering reveals that the elementary magnetic excitations in multiferroic MnWO 4 consist of low-energy dispersive electromagnons in addition to the well-known spin-wave excitations. The latter can well be modeled by a Heisenberg Hamiltonian with magnetic exchange c… [Phys. Rev. B 93, 214428] Published Tue Jun 21, 2016

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Magnetic ordering in the ultrapure site-diluted spin chain materials SrCu_{1−x} Ni_{x} O_{2} (2016)

G. Simutis, M. Thede, R. Saint-Martin, A. Mohan, C. Baines, Z. Guguchia, R. Khasanov, C. Hess, A. Revcolevschi, B. Büchner, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-24

Beschreibung: Author(s): G. Simutis, M. Thede, R. Saint-Martin, A. Mohan, C. Baines, Z. Guguchia, R. Khasanov, C. Hess, A. Revcolevschi, B. Büchner, and A. Zheludev The muon spin rotation technique is used to study magnetic ordering in ultrapure samples of SrCu 1 − x Ni x O 2 , an archetypical S = 1 / 2 antiferromagnetic Heisenberg chain system with a small number of S = 1 defects. The ordered state in the parent compound is shown to be highly homogeneous, contrary to a prev… [Phys. Rev. B 93, 214430] Published Wed Jun 22, 2016

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Exchange interactions of magnetic surfaces below two-dimensional materials (2016)

Rico Friedrich, Vasile Caciuc, Nicolae Atodiresei, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-24

Beschreibung: Author(s): Rico Friedrich, Vasile Caciuc, Nicolae Atodiresei, and Stefan Blügel In this theoretical investigation we demonstrate that the adsorption of spatially extended two-dimensional (2D) π systems such as graphene and hexagonal boron nitride on the ferromagnetic fcc Co(111) surface leads to a specific behavior of the in-plane and interlayer Co-Co magnetic exchange interact… [Phys. Rev. B 93, 220406(R)] Published Wed Jun 22, 2016

Schlagwort(e): Magnetism

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Ferromagnetic resonance and resonance modes in kagome lattices: From an open to a closed kagome structure (2016)

J. Dubowik, P. Kuświk, M. Matczak, W. Bednarski, F. Stobiecki, P. Aleshkevych, H. Szymczak, M. Kisielewski, and J. Kisielewski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-24

Beschreibung: Author(s): J. Dubowik, P. Kuświk, M. Matczak, W. Bednarski, F. Stobiecki, P. Aleshkevych, H. Szymczak, M. Kisielewski, and J. Kisielewski We present ferromagnetic resonance (FMR) investigations of 20 nm thick permalloy ( Ni 80 Fe 20 ) elements (width W = 200 nm, length L = 470 nm, period a = 500 nm) arranged in open and closed artificial kagome lattices. The measurements were done at 9.4 and 34 GHz to ensure a saturated or near-saturated magneti… [Phys. Rev. B 93, 224423] Published Wed Jun 22, 2016

Schlagwort(e): Magnetism

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Transformation of spin current by antiferromagnetic insulators (2016)

Roman Khymyn, Ivan Lisenkov, Vasil S. Tiberkevich, Andrei N. Slavin, and Boris A. Ivanov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-24

Beschreibung: Author(s): Roman Khymyn, Ivan Lisenkov, Vasil S. Tiberkevich, Andrei N. Slavin, and Boris A. Ivanov It is demonstrated theoretically that a thin layer of an anisotropic antiferromagnetic (AFM) insulator can effectively conduct spin current through the excitation of a pair of evanescent AFM spin wave modes. The spin current flowing through the AFM is not conserved due to the interaction between the… [Phys. Rev. B 93, 224421] Published Wed Jun 22, 2016

Schlagwort(e): Magnetism

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Size dependence of nanosecond-scale spin-torque switching in perpendicularly magnetized tunnel junctions (2016)

T. Devolder, A. Le Goff, and V. Nikitin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): T. Devolder, A. Le Goff, and V. Nikitin Magnetic tunnel junctions are under active consideration owing to their applications including the potential next generations of spin transfer torque memories. In view of the high symmetry of the magnetic properties and of the high frequency of the system eigenexcitations, out-of-plane magnetized systems are thought to enable a faster and simpler spin-torque-induced switching process than the formerly used in-plane magnetized systems. Unfortunately, the lack of high frequency and low current switching experiments have precluded, so far, the assessment of the speed potential of perpendicular anisotropy systems at low junction dimensions. By time resolving the switching and evidencing its stochastic aspects at the nanosecond-scale, the authors here demonstrate that a complex dynamics happens and persists down to small sized elements with always a very strong asymmetry between the two switching directions. The reversal is explained by the complex interplay between the spatial profile of the stray field emanating from the fixed system of the tunnel junction and the constraint that the switching is preferably initiated from the device edge. [Phys. Rev. B 93, 224432] Published Tue Jun 28, 2016

Schlagwort(e): Magnetism

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Ground-state phases of the spin-1J_{1} −J_{2} Heisenberg antiferromagnet on the honeycomb lattice (2016)

P. H. Y. Li and R. F. Bishop

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): P. H. Y. Li and R. F. Bishop We study the zero-temperature quantum phase diagram of a spin-1 Heisenberg antiferromagnet on the honeycomb lattice with both nearest-neighbor exchange coupling J 1 〉 0 and frustrating next-nearest-neighbor coupling J 2 ≡ κ J 1 〉 0 , using the coupled cluster method implemented to high orders of approxim… [Phys. Rev. B 93, 214438] Published Tue Jun 28, 2016

Schlagwort(e): Magnetism

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Spin Seebeck effect at microwave frequencies (2016)

Michael Schreier, Franz Kramer, Hans Huebl, Stephan Geprägs, Rudolf Gross, Sebastian T. B. Goennenwein, Timo Noack, Thomas Langner, Alexander A. Serga, Burkard Hillebrands, and Vitaliy I. Vasyuchka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): Michael Schreier, Franz Kramer, Hans Huebl, Stephan Geprägs, Rudolf Gross, Sebastian T. B. Goennenwein, Timo Noack, Thomas Langner, Alexander A. Serga, Burkard Hillebrands, and Vitaliy I. Vasyuchka We experimentally study the transient voltage response of yttrium iron garnet/platinum bilayer samples subject to periodic heating up to gigahertz frequencies. We observe an intrinsic cutoff frequency of the induced thermopower voltage, which characteristically depends on the thickness of the yttriu… [Phys. Rev. B 93, 224430] Published Tue Jun 28, 2016

Schlagwort(e): Magnetism

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Challenges in design of Kitaev materials: Magnetic interactions from competing energy scales (2016)

Stephen M. Winter, Ying Li, Harald O. Jeschke, and Roser Valentí

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): Stephen M. Winter, Ying Li, Harald O. Jeschke, and Roser Valentí Much interest has emerged in the realization of materials with quantum spin liquid ground states, which would provide fertile ground for realizing exotic excitations. Three “Kitaev” spin liquid candidate materials have been proposed – Na 2 IrO 3 , α -RuCl 3 , and α -Li 2 IrO 3 – and there has been many diverging proposals for the most relevant interactions. Here, the authors re-evaluate carefully the magnetic interactions in these materials, using nonperturbative exact diagonalization methods. The results clarify misconceptions in the literature and help estimate the potential for realizing the spin liquid state in real materials. [Phys. Rev. B 93, 214431] Published Mon Jun 27, 2016

Schlagwort(e): Magnetism

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Spin-rotational-invariant theory of transition-metal magnetism at finite temperatures: Systematic study of a single-site model (2016)

G. M. Pastor and J. Dorantes-Dávila

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): G. M. Pastor and J. Dorantes-Dávila A spin-rotational-invariant approach to the spin-fluctuation theory of itinerant-electron magnetism is proposed and evaluated in the framework of a d -band model Hamiltonian including intra-atomic exchange interactions J and the coupling to a local magnetic field B . Using a vector-field Hubbard-Strat… [Phys. Rev. B 93, 214435] Published Mon Jun 27, 2016

Schlagwort(e): Magnetism

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Twist in the bias dependence of spin torques in magnetic tunnel junctions (2016)

Sören Boyn, João Sampaio, Vincent Cros, Julie Grollier, Akio Fukushima, Hitoshi Kubota, Kay Yakushiji, and Shinji Yuasa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): Sören Boyn, João Sampaio, Vincent Cros, Julie Grollier, Akio Fukushima, Hitoshi Kubota, Kay Yakushiji, and Shinji Yuasa The spin torque in magnetic tunnel junctions possesses two components that both depend on the applied voltage. Here, we develop a method for the accurate extraction of this bias dependence from experiments over large voltage ranges. We study several junctions with different magnetic layer structure… [Phys. Rev. B 93, 224427] Published Mon Jun 27, 2016

Schlagwort(e): Magnetism

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Second-order magnetic critical points at finite magnetic fields: Revisiting Arrott plots (2016)

S. Bustingorry, F. Pomiro, G. Aurelio, and J. Curiale

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): S. Bustingorry, F. Pomiro, G. Aurelio, and J. Curiale The so-called Arrott plot, which consists in plotting H / M against M 2 , with H the applied magnetic field and M the magnetization, is used to extract valuable information in second-order magnetic phase transitions. Besides, it is widely accepted that a negative slope in the Arrott plot is indicative o… [Phys. Rev. B 93, 224429] Published Mon Jun 27, 2016

Schlagwort(e): Magnetism

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Theoretical study of interfacial damping in perpendicular anisotropy superlattices along multiple crystal orientations (2016)

T. Qu and R. H. Victora

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): T. Qu and R. H. Victora Damping, representing the loss of magnetic energy from the electrons to the lattice through the spin-orbit interaction, is calculated for Co/Pt and Co/Pd superlattices grown along the (001), (111), and (011) orientations. The damping consists of two contributions: interfacial and, usually, bulk. The… [Phys. Rev. B 93, 224426] Published Mon Jun 27, 2016

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Analyzing the enforcement of a high-spin ground state for a metallacrown single-molecule magnet (2016)

P. Happ, A. Sapozhnik, J. Klanke, P. Czaja, A. Chernenkaya, K. Medjanik, S. Schuppler, P. Nagel, M. Merz, E. Rentschler, and H. J. Elmers

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): P. Happ, A. Sapozhnik, J. Klanke, P. Czaja, A. Chernenkaya, K. Medjanik, S. Schuppler, P. Nagel, M. Merz, E. Rentschler, and H. J. Elmers We have studied element-selective magnetic properties of the hetero- and homometallic metallacrowns Cu ( II ) 2 [ 12 − MC Y N ( S h i ) − 4 ] ( Y = Cu , Fe, in short CuCu 4 and CuFe 4 ). These metallacrowns comprise four Fe or Cu ions surrounding a central Cu ion. Using x-ray magnetic circular dichroism we have probed local… [Phys. Rev. B 93, 174404] Published Tue May 03, 2016

Schlagwort(e): Magnetism

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