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Caracterização e distribuição do fitoplâncton na zona norte da costa angolana em Agosto de 2002. (2014)

Paulo André de Sousa Coelho

Universidade Agostino Neto, Luanda

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Publikationsdatum: 2021-05-19

Beschreibung: Instittuto Nacional de Investigaçao Pesqueira, INIP, luanda , Angola

Beschreibung: Bachelors

Beschreibung: Trabaho de fin cdoursado para obtençâo do grau de licenciatura em Biologica

Beschreibung: Published

Beschreibung: biologia marinha, fitoplâncton, limnologia, algas

Beschreibung: marine biology, phytoplankton, algae,

Schlagwort(e): Phytoplankton ; Nannoplankton ; Biology ; Limnology ; Algae

Repository-Name: AquaDocs

Materialart: Theses and Dissertations , Bachelor thesis

Format: 56

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Cluster algorithm for Monte Carlo simulations of spin ice (2014)

Hiromi Otsuka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Hiromi Otsuka We present an algorithm for Monte Carlo simulations of a nearest-neighbor spin-ice model based on its cluster representation. To assess its performance, we estimate a relaxation time, and find that, in contrast to the Metropolis algorithm, our algorithm does not develop spin freezing. Also, to demon... [Phys. Rev. B 90, 220406] Published Thu Dec 11, 2014

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

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Thema: Physik

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Frustration and multicriticality in the antiferromagnetic spin-1 chain (2014)

J. H. Pixley, Aditya Shashi, and Andriy H. Nevidomskyy

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): J. H. Pixley, Aditya Shashi, and Andriy H. Nevidomskyy The antiferromagnetic spin-1 chain has a venerable history and has been thought to be well understood. Here, we show that inclusion of both next-nearest-neighbor (α) and biquadratic (β) interactions results in a rich phase diagram with a multicritical point that has not been observed before. We stud... [Phys. Rev. B 90, 214426] Published Mon Dec 15, 2014

Schlagwort(e): Magnetism

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Kinetic pathways to the magnetic charge crystal in artificial dipolar spin ice (2014)

I. A. Chioar, B. Canals, D. Lacour, M. Hehn, B. Santos Burgos, T. O. Menteş, A. Locatelli, F. Montaigne, and N. Rougemaille

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): I. A. Chioar, B. Canals, D. Lacour, M. Hehn, B. Santos Burgos, T. O. Menteş, A. Locatelli, F. Montaigne, and N. Rougemaille The authors study a kagome artificial spin ice cooled from above its Curie temperature. They argue that the system after cooling, while appearing locally to be in the expected spin ice 2 phase, globally seems to be in some non-equilibrium state. [Phys. Rev. B 90, 220407] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Magnetic and electronic structure of the frustrated spin-chain compound linarite PbCuSO_{4}(OH)_{2} (2014)

M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, and A. U. B. Wolter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, and A. U. B. Wolter We present an extensive microscopic magnetic study of the quasi-one-dimensional frustrated s=1/2 spin-chain compound linarite. Angular-dependent susceptibility and 1 H-NMR measurements were performed at various temperatures in the paramagnetic state. All relevant NMR parameters, viz., the chemical, t... [Phys. Rev. B 90, 224417] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Spin-torque oscillators with thermal noise: A constant energy orbit approach (2014)

D. Pinna, D. L. Stein, and A. D. Kent

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): D. Pinna, D. L. Stein, and A. D. Kent We study the magnetization dynamics of spin-torque oscillators in the presence of thermal noise and as a function of the spin-polarization angle in a macrospin model. The macrospin has biaxial magnetic anisotropy, typical of thin film magnetic elements, with an easy axis in the film plane and a hard... [Phys. Rev. B 90, 174405] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Heisenberg-like ferromagnetism in 3d-4f intermetallic La0.75Pr0.25Co2P2 with localized Co moments (2014)

P. Lampen, M. H. Phan, H. Srikanth, K. Kovnir, P. Chai, and M. Shatruk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): P. Lampen, M. H. Phan, H. Srikanth, K. Kovnir, P. Chai, and M. Shatruk The critical behavior near the continuous paramagnetic to ferromagnetic transition in a single crystal of La0.75Pr0.25Co2P2 has been determined based on high-resolution bulk magnetization data near TC ∼ 167 K, where long-range order is established in the Co sublattice. Scaling equation of state anal... [Phys. Rev. B 90, 174404] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Quasiparticle breakdown in the quasi-one-dimensional Ising ferromagnet CoNb2O6 (2014)

Neil J. Robinson, Fabian H. L. Essler, Ivelisse Cabrera, and Radu Coldea

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Neil J. Robinson, Fabian H. L. Essler, Ivelisse Cabrera, and Radu Coldea We present experimental and theoretical evidence that an interesting quantum many-body effect—quasiparticle breakdown—occurs in the quasi-one-dimensional spin-12 Ising-like ferromagnet CoNb2O6 in its paramagnetic phase at high transverse field as a result of explicit breaking of spin inversion symme... [Phys. Rev. B 90, 174406] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Multipole order and global/site symmetry in the hidden-order phase of URu2Si2 (2014)

Michi-To Suzuki and Hiroaki Ikeda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Michi-To Suzuki and Hiroaki Ikeda On the basis of group theory and first-principles calculations, we investigate high-rank multipole orderings in URu2Si2, which have been proposed as a genuine primary order parameter in the hidden-order phase below 17.5 K. We apply Shubnikov group theory to the multipole ordered states characterized... [Phys. Rev. B 90, 184407] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Freezing a quantum magnet by repeated quantum interference: An experimental realization (2014)

Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh, and Arnab Das

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh, and Arnab Das We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [A. Das, Phys. Rev. B 82 , 172402 (2010)PRBMDO10.1103/PhysRevB.82.172402], for certain values of the drive parameters all fundamental degrees of freedom contributing to the... [Phys. Rev. B 90, 174407] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Magnetic order and spin dynamics in La2O2Fe2OSe2 probed by Fe57 Mössbauer, La139 NMR, and muon-spin relaxation spectroscopy (2014)

M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss We present a detailed local probe study of the magnetic order in the oxychalcogenide La2O2Fe2OSe2 utilizing Fe57 Mössbauer, La139 NMR, and muon-spin relaxation spectroscopy. This system can be regarded as an insulating reference system of the Fe arsenide and chalcogenide superconductors. From the co... [Phys. Rev. B 90, 184408] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Perpendicular magnetic anisotropy in CoFe/MgO/CoFe magnetic tunnel junctions by first-principles calculations (2014)

Jia Zhang, Christian Franz, Michael Czerner, and Christian Heiliger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Jia Zhang, Christian Franz, Michael Czerner, and Christian Heiliger The magnetic anisotropy in FexCo100−x/MgO/FexCo100−x magnetic tunnel junctions as a function of composition is investigated on different substrates (Cu, Ag, and MgO). We use the full relativistic screened-Korringa-Kohn-Rostoker method and employ the coherent potential approximation for description o... [Phys. Rev. B 90, 184409] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Magnetization plateaus and jumps in a frustrated four-leg spin tube under a magnetic field (2014)

F. A. Gómez Albarracín, M. Arlego, and H. D. Rosales

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-05

Beschreibung: Author(s): F. A. Gómez Albarracín, M. Arlego, and H. D. Rosales We study the ground state phase diagram of a frustrated spin-1/2 four-leg spin tube in an external magnetic field. We explore the parameter space of this model in the regime of all-antiferromagnetic exchange couplings by means of three different approaches: analysis of low-energy effective Hamiltoni... [Phys. Rev. B 90, 174403] Published Tue Nov 04, 2014

Schlagwort(e): Magnetism

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Conductance anomalies of CoFeB/MgO/CoFeB magnetic tunnel junctions (2014)

S. Ringer, M. Vieth, L. Bär, M. Rührig, and G. Bayreuther

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): S. Ringer, M. Vieth, L. Bär, M. Rührig, and G. Bayreuther The I-V characteristics of CoFeB/MgO/CoFeB magnetic tunnel junctions show pronounced nonlinearities which are relevant both for sensor applications and for the basic understanding of spin-dependent tunneling. To study the relation between the tunnel characteristics and the tunnel magnetoresistance (... [Phys. Rev. B 90, 174401] Published Mon Nov 03, 2014

Schlagwort(e): Magnetism

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Exchange splitting of surface and bulk electronic states in excited magnetic states of Gd: First-principles study (2014)

L. M. Sandratskii

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): L. M. Sandratskii Recent pump-probe experiments provide time evolution of the bulk and surface electronic states in Gd excited by the laser pulse. These experiments are in close connection with earlier spectroscopic experiments probing temperature dependence of the exchange splitting of the electronic states. We repo... [Phys. Rev. B 90, 184406] Published Wed Nov 05, 2014

Schlagwort(e): Magnetism

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Transport measurements of the spin-wave parameters of thin Mn films (2014)

S. Buvaev, S. Ghosh, K. Muttalib, P. Wölfle, and A. Hebard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): S. Buvaev, S. Ghosh, K. Muttalib, P. Wölfle, and A. Hebard This paper provides an experimental description and theoretical explanation of how disorder affects electronic transport in antiferromagnetic thin films. The authors find a quantum correction to the conductivity which survives to high disorder strength because of a high rate of inelastic scattering of electrons off of gapped antiferromagnetic spin waves. The data provide first-time estimates of the spin-wave energy gap and exchange energy derived solely from transport measurements. The focus on the unexplored effect of antiferromagnetism on electronic transport provides new perspectives on the role of electronic transport and spin alignment in disordered magnetic systems. [Phys. Rev. B 90, 214429] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Experimental and numerical understanding of localized spin wave mode behavior in broadly tunable spatially complex magnetic configurations (2014)

Chunhui Du, Rohan Adur, Hailong Wang, Sergei A. Manuilov, Fengyuan Yang, Denis V. Pelekhov, and P. Chris Hammel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): Chunhui Du, Rohan Adur, Hailong Wang, Sergei A. Manuilov, Fengyuan Yang, Denis V. Pelekhov, and P. Chris Hammel Spin wave modes confined in a ferromagnetic film by the spatially inhomogeneous magnetic field generated by a scanned micromagnetic tip of a ferromagnetic resonance force microscope (FMRFM) enable microscopic imaging of the internal fields and spin dynamics in nanoscale magnetic devices. Here we rep... [Phys. Rev. B 90, 214428] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Terahertz emission spectroscopy of laser-induced spin dynamics in TmFeO3 and ErFeO3 orthoferrites (2014)

R. V. Mikhaylovskiy, E. Hendry, V. V. Kruglyak, R. V. Pisarev, Th. Rasing, and A. V. Kimel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): R. V. Mikhaylovskiy, E. Hendry, V. V. Kruglyak, R. V. Pisarev, Th. Rasing, and A. V. Kimel Using the examples of laser-induced spin-reorientation phase transitions in TmFeO3 and ErFeO3 orthoferrites, we demonstrate that terahertz emission spectroscopy can obtain novel information about ultrafast laser-induced spin dynamics, which is not accessible by more common all-optical methods. The p... [Phys. Rev. B 90, 184405] Published Wed Nov 05, 2014

Schlagwort(e): Magnetism

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Nonlocal transport mediated by spin supercurrents (2014)

Hua Chen, Andrew D. Kent, Allan H. Mac; Donald, and Inti Sodemann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Hua Chen, Andrew D. Kent, Allan H. MacDonald, and Inti Sodemann In thin-film ferromagnets with perfect easy-plane anisotropy, the component of total spin perpendicular to the easy plane is a good quantum number and the corresponding spin supercurrent can flow without dissipation. Here we explain how spin supercurrents couple spatially remote spin-mixing vertical... [Phys. Rev. B 90, 220401] Published Mon Dec 01, 2014

Schlagwort(e): Magnetism

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Anomalous spin dynamics in CdCu_{2}(BO_{3})_{2} revealed by ^{11}B NMR and ZF-μSR (2014)

W.-J. Lee, S.-H. Do, Sungwon Yoon, Z. H. Jang, B. J. Suh, J. H. Lee, A. P. Reyes, P. L. Kuhns, H. Luetkens, and K.-Y. Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): W.-J. Lee, S.-H. Do, Sungwon Yoon, Z. H. Jang, B. J. Suh, J. H. Lee, A. P. Reyes, P. L. Kuhns, H. Luetkens, and K.-Y. Choi We report 11 B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu 2 (BO 3 ) 2 , which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at T ... [Phys. Rev. B 90, 214416] Published Thu Dec 04, 2014

Schlagwort(e): Magnetism

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Quantum theory of the inverse Faraday effect (2014)

M. Battiato, G. Barbalinardo, and P. M. Oppeneer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): M. Battiato, G. Barbalinardo, and P. M. Oppeneer We provide a quantum theoretical description of the magnetic polarization induced by intense circularly polarized light in a material. Such effect—commonly referred to as the inverse Faraday effect—is treated using beyond-linear response theory, considering the applied electromagnetic field as exter... [Phys. Rev. B 89, 014413] Published Tue Jan 14, 2014

Schlagwort(e): Magnetism

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Rotatable magnetic anisotropy in a Fe0.8Ga0.2 thin film with stripe domains: Dynamics versus statics (2014)

S. Tacchi, S. Fin, G. Carlotti, G. Gubbiotti, M. Madami, M. Barturen, M. Marangolo, M. Eddrief, D. Bisero, A. Rettori, and M. G. Pini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): S. Tacchi, S. Fin, G. Carlotti, G. Gubbiotti, M. Madami, M. Barturen, M. Marangolo, M. Eddrief, D. Bisero, A. Rettori, and M. G. Pini A comprehensive investigation of rotatable anisotropy in a Fe0.8Ga0.2 thin film with a stripe domain structure has been performed comparing static and dynamic measurements. The stripes' domain formation and their rotation under a transverse magnetic field have been imaged by magnetic force microscop... [Phys. Rev. B 89, 024411] Published Tue Jan 14, 2014

Schlagwort(e): Magnetism

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Propagation of thermally induced magnonic spin currents (2014)

Ulrike Ritzmann, Denise Hinzke, and Ulrich Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Ulrike Ritzmann, Denise Hinzke, and Ulrich Nowak The propagation of magnons in temperature gradients is investigated within the framework of an atomistic spin model with the stochastic Landau-Lifshitz-Gilbert equation as underlying equation of motion. We analyze the magnon accumulation, the magnon temperature profile, as well as the propagation le... [Phys. Rev. B 89, 024409] Published Mon Jan 13, 2014

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Tenth-order high-temperature expansion for the susceptibility and the specific heat of spin-s Heisenberg models with arbitrary exchange patterns: Application to pyrochlore and kagome magnets (2014)

Andre Lohmann, Heinz-Jürgen Schmidt, and Johannes Richter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Andre Lohmann, Heinz-Jürgen Schmidt, and Johannes Richter We present the high-temperature expansion (HTE) up to tenth order of the specific heat C and the uniform susceptibility χ for Heisenberg models with arbitrary exchange patterns and arbitrary spin quantum number s. We encode the algorithm in a c++ program provided in the Supplemental Material [http:/... [Phys. Rev. B 89, 014415] Published Wed Jan 15, 2014

Schlagwort(e): Magnetism

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Cluster functional renormalization group (2014)

Johannes Reuther and Ronny Thomale

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Johannes Reuther and Ronny Thomale Functional renormalization group (FRG) has become a diverse and powerful tool to derive effective low-energy scattering vertices of interacting many-body systems. Starting from a free expansion point of the action, the flow of the RG parameter Λ allows us to trace the evolution of the effective one-... [Phys. Rev. B 89, 024412] Published Wed Jan 15, 2014

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Domain wall motion in junctions of thin-film magnets and topological insulators (2014)

Yago Ferreiros and Alberto Cortijo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Yago Ferreiros and Alberto Cortijo We derive the equations of motionof a domain wall in a thin-film magnet coupled to the surface states of a topological insulator, in the presence of both an electric field along the domain wall and a magnetic field perpendicular to the junction. We show how the electric field acts as a chirality sta... [Phys. Rev. B 89, 024413] Published Fri Jan 17, 2014

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Ferromagnetic vortex core switching at elevated temperatures (2014)

Kristof M. Lebecki and Ulrich Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): Kristof M. Lebecki and Ulrich Nowak An approach for the investigation of vortex core switching is presented. Thermal effects up to the Curie point are included in a micromagnetic framework based on the recently developed Landau-Lifshitz-Bloch equation. In this approach it is easier to avoid numerical discretization artifacts, commonly... [Phys. Rev. B 89, 014421] Published Thu Jan 23, 2014

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Characterization of the spin-12 linear-chain ferromagnet CuAs2O4 (2014)

K. Caslin, R. K. Kremer, F. S. Razavi, A. Schulz, A. Muñoz, F. Pertlik, J. Liu, M.-H. Whangbo, and J. M. Law

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): K. Caslin, R. K. Kremer, F. S. Razavi, A. Schulz, A. Muñoz, F. Pertlik, J. Liu, M.-H. Whangbo, and J. M. Law The magnetic and lattice properties of the S=1/2 quantum-spin-chain ferromagnet CuAs2O4, mineral name trippkeite, were investigated. The crystal structure of CuAs2O4 is characterized by the presence of corrugated CuO2 ribbon chains. Measurements of the magnetic susceptibility, heat capacity, electro... [Phys. Rev. B 89, 014412] Published Mon Jan 13, 2014

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High-temperature magnetoelectricity of terbium aluminum borate: The role of excited states of the rare-earth ion (2014)

A. M. Kadomtseva, Yu. F. Popov, G. P. Vorob'ev, N. V. Kostyuchenko, A. I. Popov, A. A. Mukhin, V. Yu. Ivanov, L. N. Bezmaternykh, I. A. Gudim, V. L. Temerov, A. P. Pyatakov, and A. K. Zvezdin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): A. M. Kadomtseva, Yu. F. Popov, G. P. Vorob'ev, N. V. Kostyuchenko, A. I. Popov, A. A. Mukhin, V. Yu. Ivanov, L. N. Bezmaternykh, I. A. Gudim, V. L. Temerov, A. P. Pyatakov, and A. K. Zvezdin Recently discovered magnetoelectricity in the rare-earth aluminum borates RAl3(BO3)4 has attracted attention due to the large values of magnetoinduced electric polarization. We have observed for the first time the magnetoelectric polarization in TbAl3(BO3)4 exhibiting anomalous temperature dependenc... [Phys. Rev. B 89, 014418] Published Tue Jan 21, 2014

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Disentangling defect-induced ferromagnetism in SiC (2014)

Yutian Wang, Lin Li, Slawomir Prucnal, Xuliang Chen, Wei Tong, Zhaorong Yang, Frans Munnik, Kay Potzger, Wolfgang Skorupa, Sibylle Gemming, Manfred Helm, and Shengqiang Zhou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Yutian Wang, Lin Li, Slawomir Prucnal, Xuliang Chen, Wei Tong, Zhaorong Yang, Frans Munnik, Kay Potzger, Wolfgang Skorupa, Sibylle Gemming, Manfred Helm, and Shengqiang Zhou We present a detailed investigation of the magnetic properties in SiC single crystals bombarded with neon ions. Through careful measuring of the magnetization of virgin and irradiated SiC, we decompose the magnetization of SiC into paramagnetic, superparamagnetic, and ferromagnetic contributions. Th... [Phys. Rev. B 89, 014417] Published Tue Jan 21, 2014

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Topological magnetization jumps in a confined chiral soliton lattice (2014)

Jun-ichiro Kishine, I. G. Bostrem, A. S. Ovchinnikov, and Vl. E. Sinitsyn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Jun-ichiro Kishine, I. G. Bostrem, A. S. Ovchinnikov, and Vl. E. Sinitsyn We demonstrate that a finite-size chiral soliton lattice formed in a chiral helimagnet with fixed boundary conditions exhibits magnetization jumps in a response to the magnetic field applied perpendicular to the chiral axis. The imposed boundary conditions lead to confinement of topological charges ... [Phys. Rev. B 89, 014419] Published Wed Jan 22, 2014

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Hierarchy of exactly solvable spin-12 chains with so(N)1 critical points (2014)

Ville Lahtinen, Teresia Månsson, and Eddy Ardonne

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Ville Lahtinen, Teresia Månsson, and Eddy Ardonne We construct a hierarchy of exactly solvable spin-1/2 chains with so(N)1 critical points. Our construction is based on the framework of condensate-induced transitions between topological phases. We employ this framework to construct a Hamiltonian term that couples N transverse field Ising chains suc... [Phys. Rev. B 89, 014409] Published Fri Jan 10, 2014

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Magnetocapacitance as a sensitive probe of magnetostructural changes in NiCr2O4 (2014)

Taylor D. Sparks, Moureen C. Kemei, Phillip T. Barton, Ram Seshadri, Eun-Deok Mun, and Vivien S. Zapf

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Taylor D. Sparks, Moureen C. Kemei, Phillip T. Barton, Ram Seshadri, Eun-Deok Mun, and Vivien S. Zapf The spinel NiCr2O4 is characterized using dielectric and high-magnetic-field measurements. The trends in the magnetodielectric response fall into three clear temperature regimes corresponding to known magnetic and structural transitions. Above the Néel temperature, weak magnetic field dependence of ... [Phys. Rev. B 89, 024405] Published Fri Jan 10, 2014

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Vector-spin-chirality order in a dimerized frustrated spin-12 chain (2014)

Hiroshi Ueda and Shigeki Onoda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Hiroshi Ueda and Shigeki Onoda A frustrated spin-1/2 XXZ chain model comprising a ferromagnetic nearest-neighbor coupling with the bond alternation, J1(1±δ)〈0, and an antiferromagnetic second-neighbor exchange coupling J2〉0 is studied at zero and weak magnetic fields by means of density-matrix renormalization-group calculat... [Phys. Rev. B 89, 024407] Published Fri Jan 10, 2014

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Orbital structure and magnetic ordering in stoichiometric and doped crednerite CuMnO2 (2014)

A. V. Ushakov, S. V. Streltsov, and D. I. Khomskii

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): A. V. Ushakov, S. V. Streltsov, and D. I. Khomskii The exchange interactions and magnetic structure in layered system CuMnO2 (mineral crednerite) and in nonstoichiometric system Cu1.04Mn0.96O2, with triangular layers distorted due to orbital ordering of the Mn3+ ions, are studied by ab initio band-structure calculations, which were performed within ... [Phys. Rev. B 89, 024406] Published Fri Jan 10, 2014

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Critical behavior of spin and chiral degrees of freedom in three-dimensional disordered XY models studied by the nonequilibrium aging method (2014)

F. Romá and D. Domínguez

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): F. Romá and D. Domínguez The critical behavior of the gauge-glass and the XY spin-glass models in three dimensions is studied by analyzing their nonequilibrium aging dynamics. A new numerical method, which relies on the calculation of the two-time correlation and integrated response functions, is used to determine both the ... [Phys. Rev. B 89, 024408] Published Mon Jan 13, 2014

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Magnetism of iron oxide based core-shell nanoparticles from interface mixing with enhanced spin-orbit coupling (2014)

E. Skoropata, R. D. Desautels, C.-C. Chi, H. Ouyang, J. W. Freeland, and J. van Lierop

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): E. Skoropata, R. D. Desautels, C.-C. Chi, H. Ouyang, J. W. Freeland, and J. van Lierop We show that the magnetism of core-shell nanoparticles (made of maghemite, γ-Fe2O3, cores and transition-metal and metal-oxide shells) is altered substantially by the interface, which is a doped iron-oxide layer formed naturally during the seed-mediated synthesis process, a route used typically to p... [Phys. Rev. B 89, 024410] Published Mon Jan 13, 2014

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Inelastic neutron scattering studies of YFeO3 (2014)

S. E. Hahn, A. A. Podlesnyak, G. Ehlers, G. E. Granroth, R. S. Fishman, A. I. Kolesnikov, E. Pomjakushina, and K. Conder

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): S. E. Hahn, A. A. Podlesnyak, G. Ehlers, G. E. Granroth, R. S. Fishman, A. I. Kolesnikov, E. Pomjakushina, and K. Conder Spin waves in the rare-earth orthorferrite YFeO3 have been studied by inelastic neutron scattering and analyzed with a full four-sublattice model including contributions from both the weak ferromagnetic and antiferromagnetic orders. Antiferromagnetic exchange interactions of J1=−4.23±0.08 (nearest n... [Phys. Rev. B 89, 014420] Published Thu Jan 23, 2014

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Anisotropic magnetothermal transport and spin Seebeck effect (2014)

J.-E. Wegrowe, H.-J. Drouhin, and D. Lacour

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): J.-E. Wegrowe, H.-J. Drouhin, and D. Lacour The anisotropic properties of thermal transport in insulating or conducting ferromagnets are derived on the basis of the Onsager reciprocity relations applied to a magnetic system. It is shown that the angular dependence of the temperature gradient takes the same form as that of the anisotropic magn... [Phys. Rev. B 89, 094409] Published Mon Mar 10, 2014

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Suppression of antiferromagnetism by pressure in CaCo2P2 (2014)

R. E. Baumbach, V. A. Sidorov, Xin Lu, N. J. Ghimire, F. Ronning, B. L. Scott, D. J. Williams, E. D. Bauer, and J. D. Thompson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): R. E. Baumbach, V. A. Sidorov, Xin Lu, N. J. Ghimire, F. Ronning, B. L. Scott, D. J. Williams, E. D. Bauer, and J. D. Thompson We report magnetization M, heat capacity C, and electrical resistivity ρ for single crystals of the itinerant electron antiferromagnet CaCo2P2 (TN ≈ 110 K). Measurements at ambient pressure reveal rich magnetic behavior, where ferromagnetic correlations are present in the paramagnetic state and a su... [Phys. Rev. B 89, 094408] Published Mon Mar 10, 2014

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Effects of hole doping on magnetic and lattice excitations in Sr2Ir1−xRuxO4 (x=0–0.2) (2014)

A. Glamazda, W.-J. Lee, K.-Y. Choi, P. Lemmens, H. Y. Choi, N. Lee, and Y. J. Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): A. Glamazda, W.-J. Lee, K.-Y. Choi, P. Lemmens, H. Y. Choi, N. Lee, and Y. J. Choi Raman scattering is employed to explore the effects of hole doping in single crystals of Sr2Ir1−xRuxO4 (x=0, 0.01, 0.03, 0.05, 0.1, and 0.2). Introducing a few percentages of holes has a strong impact on magnetic excitations and lattice dynamics. With increasing x the well structured two-magnon cont... [Phys. Rev. B 89, 104406] Published Mon Mar 10, 2014

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Pressure effect on magnetism and multiferroicity in Mn2GeO4 (2014)

T. Honda, T. Aoyama, J. S. White, Th. Strässle, L. Keller, M. Kenzelmann, F. Honda, A. Miyake, K. Shimizu, Y. Wakabayashi, and T. Kimura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): T. Honda, T. Aoyama, J. S. White, Th. Strässle, L. Keller, M. Kenzelmann, F. Honda, A. Miyake, K. Shimizu, Y. Wakabayashi, and T. Kimura The effect of high pressure exceeding 6 GPa on magnetism and multiferroicity was investigated for the olivine Mn2GeO4 that shows successive magnetic transitions at ambient pressure and a ferroelectric ground state driven by spin-spiral order. We measured heat capacity, dielectric constant, and elect... [Phys. Rev. B 89, 104405] Published Mon Mar 10, 2014

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Excitations and quasi-one-dimensionality in field-induced nematic and spin density wave states (2014)

Oleg A. Starykh and Leon Balents

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Oleg A. Starykh and Leon Balents We study the excitation spectrum and dynamical response functions for several quasi-one-dimensional spin systems in magnetic fields without dipolar spin order transverse to the field. This includes both nematic phases, which harbor “hidden” breaking of spin-rotation symmetry about the field and have... [Phys. Rev. B 89, 104407] Published Mon Mar 10, 2014

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Weak spin interactions in Mott insulating La2O2Fe2OSe2 (2014)

E. E. McCabe, C. Stock, E. E. Rodriguez, A. S. Wills, J. W. Taylor, and J. S. O. Evans

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): E. E. McCabe, C. Stock, E. E. Rodriguez, A. S. Wills, J. W. Taylor, and J. S. O. Evans Identifying and characterizing the parent phases of iron-based superconductors is an important step towards understanding the mechanism for their high-temperature superconductivity. We present an investigation into the magnetic interactions in the Mott insulator La2O2Fe2OSe2. This iron oxyselenide a... [Phys. Rev. B 89, 100402] Published Mon Mar 10, 2014

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Chiral skyrmions in cubic helimagnet films: The role of uniaxial anisotropy (2014)

M. N. Wilson, A. B. Butenko, A. N. Bogdanov, and T. L. Monchesky

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): M. N. Wilson, A. B. Butenko, A. N. Bogdanov, and T. L. Monchesky This paper reports on magnetometry and magnetoresistance measurements of MnSi epilayers performed in out-of-plane magnetic fields. We present a theoretical analysis of the chiral modulations that arise in confined cubic helimagnets where the uniaxial anisotropy axis and magnetic field are both out-o... [Phys. Rev. B 89, 094411] Published Wed Mar 12, 2014

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Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt (2014)

Andrea Droghetti, Sabine Steil, Nicolas Großmann, Norman Haag, Hongtao Zhang, Maureen Willis, William P. Gillin, Alan J. Drew, Martin Aeschlimann, Stefano Sanvito, and Mirko Cinchetti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Andrea Droghetti, Sabine Steil, Nicolas Großmann, Norman Haag, Hongtao Zhang, Maureen Willis, William P. Gillin, Alan J. Drew, Martin Aeschlimann, Stefano Sanvito, and Mirko Cinchetti It was recently established that spin injection from a ferromagnetic metal into an organic semiconductor depends largely on the formation of hybrid interface states. Here we investigate whether the magnetic properties of the interface between cobalt and tris(8-hydroxyquinolinato)-Al(III) (Alq3), the... [Phys. Rev. B 89, 094412] Published Wed Mar 12, 2014

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Role of geometrical symmetry in thermally activated processes in clusters of interacting dipolar moments (2014)

O. Hovorka, J. Barker, G. Friedman, and R. W. Chantrell

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): O. Hovorka, J. Barker, G. Friedman, and R. W. Chantrell Thermally activated magnetization decay is studied in ensembles of clusters of interacting dipolar moments by applying the master-equation formalism, as a model of thermal relaxation in systems of interacting single-domain ferromagnetic particles. Solving the associated master equation reveals a bre... [Phys. Rev. B 89, 104410] Published Wed Mar 12, 2014

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Magnetic phase diagram and first-principles study of Pb3TeCo3V2O14 (2014)

M. M. Markina, B. V. Mill, E. A. Zvereva, A. V. Ushakov, S. V. Streltsov, and A. N. Vasiliev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): M. M. Markina, B. V. Mill, E. A. Zvereva, A. V. Ushakov, S. V. Streltsov, and A. N. Vasiliev An antiferromagnetic ordering in Pb3TeCo3V2O14 takes place through formation of a short-range correlation regime with T* ∼ 10.5 K and the succession of a second-order phase transition at TN1 = 8.9 K and a first-order phase transition at TN2 = 6.3 K. An external magnetic field rapidly destroys magnet... [Phys. Rev. B 89, 104409] Published Wed Mar 12, 2014

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Oxygen-vacancy-induced local ferromagnetism as a driving mechanism in enhancing the magnetic response of ferrites (2014)

C. E. Rodríguez Torres, G. A. Pasquevich, P. Mendoza Zélis, F. Golmar, S. P. Heluani, Sanjeev K. Nayak, Waheed A. Adeagbo, Wolfram Hergert, Martin Hoffmann, Arthur Ernst, P. Esquinazi, and S. J. Stewart

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): C. E. Rodríguez Torres, G. A. Pasquevich, P. Mendoza Zélis, F. Golmar, S. P. Heluani, Sanjeev K. Nayak, Waheed A. Adeagbo, Wolfram Hergert, Martin Hoffmann, Arthur Ernst, P. Esquinazi, and S. J. Stewart This work probes the relevance of oxygen vacancies in the formation of local ferromagnetic coupling between Fe ions at octahedral sites in zinc ferrites. This coupling gives rise to a ferrimagnetic ordering with the Curie temperatures above room temperature in an otherwise antiferromagnetic compound... [Phys. Rev. B 89, 104411] Published Thu Mar 13, 2014

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Electrical detection of internal dynamical properties of domain walls (2014)

Soraya Sangiao and Michel Viret

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): Soraya Sangiao and Michel Viret We report here on the electrical detection of the ferromagnetic resonance in a notched Py stripe using the spin rectification effect. A lock-in detection technique is used to measure the rectified voltage generated when applying a radio-frequency field. The multiple peaks associated with the presenc... [Phys. Rev. B 89, 104412] Published Thu Mar 13, 2014

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Low-energy magnetic excitations in the spin-orbital Mott insulator Sr2IrO4 (2014)

S. Bahr, A. Alfonsov, G. Jackeli, G. Khaliullin, A. Matsumoto, T. Takayama, H. Takagi, B. Büchner, and V. Kataev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-02

Beschreibung: Author(s): S. Bahr, A. Alfonsov, G. Jackeli, G. Khaliullin, A. Matsumoto, T. Takayama, H. Takagi, B. Büchner, and V. Kataev We report a high-field electron spin resonance study in the sub-THz frequency domain of a single crystal of Sr2IrO4 that has been recently proposed as a prototypical spin-orbital Mott insulator. In the antiferromagnetically ordered state with noncollinear spin structure that occurs in this material ... [Phys. Rev. B 89, 180401] Published Thu May 01, 2014

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Equal-interval splitting of quantum tunneling in single-molecule magnets with identical exchange coupling (2014)

Yan-Rong Li, Rui-Yuan Liu, Hai-Qing Liu, and Yun-Ping Wang

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Yan-Rong Li, Rui-Yuan Liu, Hai-Qing Liu, and Yun-Ping Wang The equal-interval splitting of quantum tunneling observed in simple-Ising-model systems of Ni4 (3D) and Mn3 (2D) single-molecule magnets (SMMs) is reported. The splitting is due to the identical exchange coupling in the SMMs, and is simply determined by the difference between the two numbers of the... [Phys. Rev. B 89, 184401] Published Thu May 01, 2014

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Quantum fluctuations in anisotropic triangular lattices with ferromagnetic and antiferromagnetic exchange (2014)

Burkhard Schmidt and Peter Thalmeier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-02

Beschreibung: Author(s): Burkhard Schmidt and Peter Thalmeier The Heisenberg model on a triangular lattice is a prime example of a geometrically frustrated spin system. However most experimentally accessible compounds have spatially anisotropic exchange interactions. As a function of this anisotropy, ground states with different magnetic properties can be real... [Phys. Rev. B 89, 184402] Published Thu May 01, 2014

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Voltage control of magnetic anisotropy in Fe films with quantum well states (2014)

Uwe Bauer, Marek Przybylski, and Geoffrey S. D. Beach

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): Uwe Bauer, Marek Przybylski, and Geoffrey S. D. Beach The influence of a gate voltage on magnetic anisotropy is investigated in a thin Fe film epitaxially grown on a Ag(1,1,10) substrate and covered by MgO. Oscillations in step-induced magnetic anisotropy due to quantum well states (QWS) confined in the Fe film are observed and shown to persist up to r... [Phys. Rev. B 89, 174402] Published Fri May 02, 2014

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Magnetic properties and magnon excitations in Fe(001) films grown on Ir(001) (2014)

T.-H. Chuang, Kh. Zakeri, A. Ernst, Y. Zhang, H. J. Qin, Y. Meng, Y.-J. Chen, and J. Kirschner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): T.-H. Chuang, Kh. Zakeri, A. Ernst, Y. Zhang, H. J. Qin, Y. Meng, Y.-J. Chen, and J. Kirschner We present a comprehensive study of magnetic properties and high wave-vector magnon excitations in epitaxial Fe(001) films grown on Ir(001) substrate. The magnetic properties are investigated by magneto-optical Kerr effect for various thicknesses of Fe film from 4 up to 27 monolayers. The magnon dis... [Phys. Rev. B 89, 174404] Published Fri May 02, 2014

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Structural and magnetic properties of CoO-Pt core-shell nanoparticles (2014)

Adriana Zeleňáková, Vladimir Zeleňák, Štefan Michalík, Jozef Kováč, and Mark W. Meisel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): Adriana Zeleňáková, Vladimir Zeleňák, Štefan Michalík, Jozef Kováč, and Mark W. Meisel Using microemulsion methods, CoO-Pt core-shell nanoparticles, with diameters of nominally 4 nm, were synthesized and characterized by high-resolution transmission electron microscopy and a suite of x-ray spectroscopies, including diffraction, absorption, absorption near-edge structure, and extended ... [Phys. Rev. B 89, 104417] Published Thu Mar 20, 2014

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Nonswitchable magnetic moments in polycrystalline and (111)-epitaxial permalloy/CoO exchange-biased bilayers (2014)

S.-W. Chen, X. Lu, E. Blackburn, V. Lauter, H. Ambaye, K. T. Chan, E. E. Fullerton, A. E. Berkowitz, and S. K. Sinha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): S.-W. Chen, X. Lu, E. Blackburn, V. Lauter, H. Ambaye, K. T. Chan, E. E. Fullerton, A. E. Berkowitz, and S. K. Sinha We have measured the interfacial magnetization depth profile in ferromagnet/antiferromagnet exchange-coupled NiFe/CoO bilayers. Both a polycrystalline and an epitaxial-(111) bilayer were examined. We find that the nonswitchable magnetization profile in the biased state is highly correlated with the ... [Phys. Rev. B 89, 094419] Published Thu Mar 20, 2014

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Microscopic magnetic modeling for the S=12 alternating-chain compounds Na3Cu2SbO6 and Na2Cu2TeO6 (2014)

M. Schmitt, O. Janson, S. Golbs, M. Schmidt, W. Schnelle, J. Richter, and H. Rosner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): M. Schmitt, O. Janson, S. Golbs, M. Schmidt, W. Schnelle, J. Richter, and H. Rosner The spin-1/2 alternating Heisenberg chain system Na3Cu2SbO6 features two relevant exchange couplings: J1a within the structural Cu2O6 dimers and J1b between the dimers. Motivated by the controversially discussed nature of J1a, we perform extensive density-functional-theory (DFT) calculations, includ... [Phys. Rev. B 89, 174403] Published Fri May 02, 2014

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High-field electron spin resonance spectroscopy of singlet-triplet transitions in the spin-dimer systems Sr3Cr2O8 and Ba3Cr2O8 (2014)

Zhe Wang, D. Kamenskyi, O. Cépas, M. Schmidt, D. L. Quintero-Castro, A. T. M. N. Islam, B. Lake, A. A. Aczel, H. A. Dabkowska, A. B. Dabkowski, G. M. Luke, Yuan Wan, A. Loidl, M. Ozerov, J. Wosnitza, S. A. Zvyagin, and J. Deisenhofer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Zhe Wang, D. Kamenskyi, O. Cépas, M. Schmidt, D. L. Quintero-Castro, A. T. M. N. Islam, B. Lake, A. A. Aczel, H. A. Dabkowska, A. B. Dabkowski, G. M. Luke, Yuan Wan, A. Loidl, M. Ozerov, J. Wosnitza, S. A. Zvyagin, and J. Deisenhofer Magnetic excitations in the isostructural spin-dimer systems Sr3Cr2O8 and Ba3Cr2O8 are probed by means of high-field electron spin resonance at subterahertz frequencies. Three types of magnetic modes were observed. One mode is gapless and corresponds to transitions within excited states, while two o... [Phys. Rev. B 89, 174406] Published Mon May 05, 2014

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Critical scaling analysis of the itinerant ferromagnet Sr1−xCaxRuO3 (2014)

D. Fuchs, M. Wissinger, J. Schmalian, C.-L. Huang, R. Fromknecht, R. Schneider, and H. v. Löhneysen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): D. Fuchs, M. Wissinger, J. Schmalian, C.-L. Huang, R. Fromknecht, R. Schneider, and H. v. Löhneysen The critical behavior of Sr1−xCaxRuO3 was investigated by a scaling analysis based on the Arrott-Noakes equation of state. The critical exponents β, γ, and δ of the magnetic critical behavior were extracted for samples with 0 ≤x≤0.6 . The ferromagnetic system exhibits a smooth suppression of the Cur... [Phys. Rev. B 89, 174405] Published Mon May 05, 2014

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Crossover from diffusive to tunneling regime in NbN/DyN/NbN ferromagnetic semiconductor tunnel junctions (2014)

P. K. Muduli, Avradeep Pal, and Mark G. Blamire

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): P. K. Muduli, Avradeep Pal, and Mark G. Blamire We have investigated NbN-DyN-NbN junctions with 1 to 10 nm thick DyN barriers. A crossover from diffusive (hopping) to tunneling-type transport was found in these junctions as the DyN thickness is reduced below ∼4 nm. We have also made a detailed study of magnetic and electrical properties of thicke... [Phys. Rev. B 89, 094414] Published Wed Mar 19, 2014

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Spiral antiferromagnets beyond the spin-wave approximation: Frustrated XY and Heisenberg models on the honeycomb lattice (2014)

Andrea Di Ciolo, Juan Carrasquilla, Federico Becca, Marcos Rigol, and Victor Galitski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Andrea Di Ciolo, Juan Carrasquilla, Federico Becca, Marcos Rigol, and Victor Galitski We examine the stability of classical states with a generic incommensurate spiral order against quantum fluctuations. Specifically, we focus on the frustrated spin-1/2 XY and Heisenberg models on the honeycomb lattice with nearest-neighbor J1 and next-nearest-neighbor J2 antiferromagnetic couplings.... [Phys. Rev. B 89, 094413] Published Wed Mar 19, 2014

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Lattice and spin excitations in multiferroic h-YMnO3 (2014)

C. Toulouse, J. Liu, Y. Gallais, M.-A. Measson, A. Sacuto, M. Cazayous, L. Chaix, V. Simonet, S. de Brion, L. Pinsard-Godart, F. Willaert, J. B. Brubach, P. Roy, and S. Petit

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): C. Toulouse, J. Liu, Y. Gallais, M.-A. Measson, A. Sacuto, M. Cazayous, L. Chaix, V. Simonet, S. de Brion, L. Pinsard-Godart, F. Willaert, J. B. Brubach, P. Roy, and S. Petit We used Raman and terahertz spectroscopies to investigate lattice and magnetic excitations and their cross coupling in the hexagonal YMnO3 multiferroic. Two phonon modes are strongly affected by the magnetic order. Magnon excitations have been identified thanks to comparison with neutron measurement... [Phys. Rev. B 89, 094415] Published Wed Mar 19, 2014

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Plaquette valence-bond solid in the square-lattice J1-J2 antiferromagnet Heisenberg model: A bond operator approach (2014)

R. L. Doretto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): R. L. Doretto We study the plaquette valence-bond solid phase of the spin-1/2J1-J2 antiferromagnet Heisenberg model on the square lattice within the bond-operator theory. We start by considering four S=1/2 spins on a single plaquette and determine the bond operator representation for the spin operators in terms o... [Phys. Rev. B 89, 104415] Published Wed Mar 19, 2014

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Valence bond distribution and correlation in bipartite Heisenberg antiferromagnets (2014)

David Schwandt, Fabien Alet, and Masaki Oshikawa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): David Schwandt, Fabien Alet, and Masaki Oshikawa Every singlet state of a quantum spin-1/2 system can be decomposed into a linear combination of valence bond basis states. The range of valence bonds within this linear combination as well as the correlations between them can reveal the nature of the singlet state and are key ingredients in variatio... [Phys. Rev. B 89, 104416] Published Wed Mar 19, 2014

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Emergent criticality and Friedan scaling in a two-dimensional frustrated Heisenberg antiferromagnet (2014)

Peter P. Orth, Premala Chandra, Piers Coleman, and Jörg Schmalian

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Peter P. Orth, Premala Chandra, Piers Coleman, and Jörg Schmalian We study a two-dimensional frustrated Heisenberg antiferromagnet on the windmill lattice consisting of triangular and dual honeycomb lattice sites. In the classical ground state, the spins on different sublattices are decoupled, but quantum and thermal fluctuations drive the system into a coplanar s... [Phys. Rev. B 89, 094417] Published Wed Mar 19, 2014

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Spin ordering and dynamics in the frustrated antiferromagnet YBaCo4O7.1 (2014)

S. Yuan, X. Hu, P. L. Kuhns, A. P. Reyes, J. S. Brooks, T. Besara, T. Siegrist, H. Zheng, J. F. Mitchell, and M. J. R. Hoch

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): S. Yuan, X. Hu, P. L. Kuhns, A. P. Reyes, J. S. Brooks, T. Besara, T. Siegrist, H. Zheng, J. F. Mitchell, and M. J. R. Hoch The stoichiometric 114-layered material YBaCo4O7 exhibits long-range antiferromagnetic order below a Néel temperature of 106 K. Nonstoichiometric YBaCo4O7.1, which contains a relatively small amount (1.4%) of interstitial oxygen, has recently been shown to have drastically modified magnetic properti... [Phys. Rev. B 89, 094416] Published Wed Mar 19, 2014

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Helical order and multiferroicity in the S=12 quasi-kagome system KCu3As2O7(OD)3 (2014)

G. J. Nilsen, Y. Okamoto, H. Ishikawa, V. Simonet, C. V. Colin, A. Cano, L. C. Chapon, T. Hansen, H. Mutka, and Z. Hiroi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): G. J. Nilsen, Y. Okamoto, H. Ishikawa, V. Simonet, C. V. Colin, A. Cano, L. C. Chapon, T. Hansen, H. Mutka, and Z. Hiroi Several Cu2+ hydroxide minerals have been recently identified as candidate realizations of the S=1/2 kagome Heisenberg model. In this context, we have studied the distorted system KCu3As2O7(OD)3 using neutron scattering and bulk measurements. Although the distortion favors magnetic order over a spin... [Phys. Rev. B 89, 140412] Published Mon Apr 28, 2014

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Quantitative characterization of the spin-orbit torque using harmonic Hall voltage measurements (2014)

Masamitsu Hayashi, Junyeon Kim, Michihiko Yamanouchi, and Hideo Ohno

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-30

Beschreibung: Author(s): Masamitsu Hayashi, Junyeon Kim, Michihiko Yamanouchi, and Hideo Ohno Solid understanding of current induced torques is a key to the development of current and voltage controlled magnetization dynamics in ultrathin magnetic heterostructures. To evaluate the size and direction of such torques, or effective fields, a number of methods have been employed. Here, we examin... [Phys. Rev. B 89, 144425] Published Tue Apr 29, 2014

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Impurity-vacancy complexes and ferromagnetism in doped sesquioxides (2014)

Paola Alippi, Maura Cesaria, and Vincenzo Fiorentini

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Paola Alippi, Maura Cesaria, and Vincenzo Fiorentini Based on hybrid density-functional calculations, we propose that ferromagnetism in the prototypical bixbyite sesquioxide In2O3 doped with Cr is due to Cr-oxygen vacancy complexes, while isolated Cr cannot support carrier-mediated magnetic coupling. Our proposal is consistent with experimental facts ... [Phys. Rev. B 89, 134423] Published Thu Apr 24, 2014

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Unusual spin fluctuations and magnetic frustration in olivine and non-olivine LiCoPO4 detected by P31 and Li7 nuclear magnetic resonance (2014)

S.-H. Baek, R. Klingeler, C. Neef, C. Koo, B. Büchner, and H.-J. Grafe

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): S.-H. Baek, R. Klingeler, C. Neef, C. Koo, B. Büchner, and H.-J. Grafe We report P31 and Li7 nuclear magnetic resonance (NMR) studies in new non-olivine LiZnPO4-type LiCoPO4tetra microcrystals, where the Co2+ ions are tetrahedrally coordinated. Olivine LiCoPO4, which was directly transformed from LiCoPO4tetra by an annealing process, was also studied and compared. The ... [Phys. Rev. B 89, 134424] Published Thu Apr 24, 2014

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Origin of the asymmetric exchange bias in BiFeO3/Bi2Fe4O9 nanocomposite (2014)

Tuhin Maity, Sudipta Goswami, Dipten Bhattacharya, and Saibal Roy

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Tuhin Maity, Sudipta Goswami, Dipten Bhattacharya, and Saibal Roy We show from detailed magnetometry across 2–300 K that the BiFeO3-Bi2Fe4O9 nanocomposite offers a unique spin morphology where superspin glass (SSG) and dilute antiferromagnet in a field (DAFF) coexist at the interface between ferromagnetic Bi2Fe4O9 and antiferromagnetic BiFeO3. The coexisting SSG a... [Phys. Rev. B 89, 140411] Published Thu Apr 24, 2014

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Itinerant and local-moment magnetism in EuCr2As2 single crystals (2014)

U. B. Paramanik, R. Prasad, C. Geibel, and Z. Hossain

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-26

Beschreibung: Author(s): U. B. Paramanik, R. Prasad, C. Geibel, and Z. Hossain We report on the crystal structure, physical properties, and electronic structure calculations for the ternary pnictide compound EuCr2As2. X-ray diffraction studies confirmed that EuCr2As2 crystalizes in the ThCr2Si2-type tetragonal structure (space group I4/mmm). The Eu ions are in a stable divalen... [Phys. Rev. B 89, 144423] Published Fri Apr 25, 2014

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Evidence for hidden quadrupolar fluctuations behind the octupole order in Ce0.7La0.3B6 from resonant x-ray diffraction in magnetic fields (2014)

Takeshi Matsumura, Shinji Michimura, Toshiya Inami, Toru Otsubo, Hiroshi Tanida, Fumitoshi Iga, and Masafumi Sera

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Takeshi Matsumura, Shinji Michimura, Toshiya Inami, Toru Otsubo, Hiroshi Tanida, Fumitoshi Iga, and Masafumi Sera The multipole ordered phase in Ce0.7La0.3B6, emerging below 1.5 K and named phase IV, has been studied by resonant x-ray diffraction in magnetic fields. By utilizing diamond x-ray phase plates to rotate the incident linear polarization and a conventional crystal analyzer system, full linear polariza... [Phys. Rev. B 89, 014422] Published Fri Jan 24, 2014

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Magnetic and electronic properties of Ca1−xNaxCr2O4: Double-exchange interactions and ligand holes (2014)

Hiroya Sakurai

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Hiroya Sakurai β-CaCr2O4 has a cycloidal magnetic structure and isostructural NaCr2O4 shows unconventional colossal magnetoresistance below a canted antiferromagnetic (AFM) ordering temperature of TN=125 K. In this paper, magnetic and electronic properties of the solid-solution system Ca1−xNaxCr2O4, are investigat... [Phys. Rev. B 89, 024416] Published Mon Jan 27, 2014

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J. M. Law, H.-J. Koo, M.-H. Whangbo, E. Brücher, V. Pomjakushin, and R. K. Kremer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-29

Beschreibung: Author(s): J. M. Law, H.-J. Koo, M.-H. Whangbo, E. Brücher, V. Pomjakushin, and R. K. Kremer The magnetic properties of NiTa2O6 were investigated by magnetic susceptibility, specific heat, electron paramagnetic resonance, neutron powder diffraction, and pulse field magnetization measurements. Accompanying ab initio DFT calculations of the spin-exchange constants complemented and supported o... [Phys. Rev. B 89, 014423] Published Tue Jan 28, 2014

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Complex magnetic behavior of the sawtooth Fe chains in Rb2Fe2O(AsO4)2 (2014)

V. Ovidiu Garlea, Liurukara D. Sanjeewa, Michael A. McGuire, Pramod Kumar, Dino Sulejmanovic, Jian He, and Shiou-Jyh Hwu

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): V. Ovidiu Garlea, Liurukara D. Sanjeewa, Michael A. McGuire, Pramod Kumar, Dino Sulejmanovic, Jian He, and Shiou-Jyh Hwu Results of magnetic field and temperature-dependent neutron-diffraction and magnetization measurements on oxy-arsenate Rb2Fe2O(AsO4)2 are reported. The crystal structure of this compound contains pseudo-one-dimensional [Fe2O6]∞ sawtoothlike chains, formed by corner-sharing isosceles triangles of Fe3... [Phys. Rev. B 89, 014426] Published Wed Jan 29, 2014

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Laser control of ultrafast spin dynamics on homodinuclear iron- and nickel-oxide clusters (2014)

Wei Jin, Chun Li, Georgios Lefkidis, and Wolfgang Hübner

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Wei Jin, Chun Li, Georgios Lefkidis, and Wolfgang Hübner We present a fully ab initio theory for coherent laser-induced ultrafast spin manipulation on the homodinuclear magnetic clusters FeOFe, FeOOFe, NiONi, and NiOONi. With the oxygen atom(s) bridging the magnetically active centers, the clusters tend to adopt asymmetric geometries due to the Jahn-Telle... [Phys. Rev. B 89, 024419] Published Wed Jan 29, 2014

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Unconventional critical scaling of magnetization in ferromagnetic uranium superconductors UGe2 and URhGe (2014)

Naoyuki Tateiwa, Yoshinori Haga, Tatsuma D. Matsuda, Etsuji Yamamoto, and Zachary Fisk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-25

Beschreibung: Author(s): Naoyuki Tateiwa, Yoshinori Haga, Tatsuma D. Matsuda, Etsuji Yamamoto, and Zachary Fisk We report a dc magnetization study of the critical phenomenon around the ferromagnetic transition temperature TC in high-quality single crystals of uranium ferromagnetic superconductors UGe2 and URhGe. The critical exponents, β for the temperature dependence of the magnetization below TC, γ for the ... [Phys. Rev. B 89, 064420] Published Mon Feb 24, 2014

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Experimental evidence for lamellar magnetism in hemo-ilmenite by polarized neutron scattering (2014)

Erik Brok, Morten Sales, Kim Lefmann, Luise Theil Kuhn, Wolfgang F. Schmidt, Bertrand Roessli, Peter Robinson, Suzanne A. McEnroe, and Richard J. Harrison

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-27

Beschreibung: Author(s): Erik Brok, Morten Sales, Kim Lefmann, Luise Theil Kuhn, Wolfgang F. Schmidt, Bertrand Roessli, Peter Robinson, Suzanne A. McEnroe, and Richard J. Harrison Large local anomalies in the Earth's magnetic field have been observed in Norway, Sweden, and Canada. These anomalies have been attributed to the unusual magnetic properties of naturally occurring hemo-ilmenite, consisting of a paramagnetic ilmenite host (α-Fe2O3-bearing FeTiO3) with exsolution lame... [Phys. Rev. B 89, 054430] Published Wed Feb 26, 2014

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Spin-orbit-coupled transport and spin torque in a ferromagnetic heterostructure (2014)

Xuhui Wang, Christian Ortiz Pauyac, and Aurélien Manchon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-08

Beschreibung: Author(s): Xuhui Wang, Christian Ortiz Pauyac, and Aurélien Manchon Ferromagnetic heterostructures provide an ideal platform to explore the nature of spin-orbit torques arising from the interplay mediated by itinerant electrons between a Rashba-type spin-orbit coupling and a ferromagnetic exchange interaction. For such a prototypic system, we develop a set of couple... [Phys. Rev. B 89, 054405] Published Fri Feb 07, 2014

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Spin-dependent optical response of multiferroic EuO: First-principles DFT calculations (2014)

Wen-Yi Tong, Hang-Chen Ding, Yong-Chao Gao, Shi-Jing Gong, Xiangang Wan, and Chun-Gang Duan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-08

Beschreibung: Author(s): Wen-Yi Tong, Hang-Chen Ding, Yong-Chao Gao, Shi-Jing Gong, Xiangang Wan, and Chun-Gang Duan Using first-principles density functional calculations, electronic and optical properties of ferromagnetic semiconductor EuO are investigated. In particular, we have developed a way to obtain the spin-dependent optical response of the magnetic materials, which is helpful to verify the spin-dependent... [Phys. Rev. B 89, 064404] Published Fri Feb 07, 2014

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Local magnetism and spin correlations in the geometrically frustrated cluster magnet LiZn2Mo3O8 (2014)

J. P. Sheckelton, F. R. Foronda, Li; Dong Pan, C. Moir, R. D. McDonald, T. Lancaster, P. J. Baker, N. P. Armitage, T. Imai, S. J. Blundell, and T. M. McQueen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-12

Beschreibung: Author(s): J. P. Sheckelton, F. R. Foronda, LiDong Pan, C. Moir, R. D. McDonald, T. Lancaster, P. J. Baker, N. P. Armitage, T. Imai, S. J. Blundell, and T. M. McQueen LiZn2Mo3O8 has been proposed to contain S=½Mo3O13 magnetic clusters arranged on a triangular lattice with antiferromagnetic nearest-neighbor interactions. Here, microwave and terahertz electron spin resonance, Li7 nuclear magnetic resonance, and muon spin rotation spectroscopies are used to characte... [Phys. Rev. B 89, 064407] Published Tue Feb 11, 2014

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First-principles evidence of Mn moment canting in hole-doped Ba1−2xK2xMn2As2 (2014)

J. K. Glasbrenner and I. I. Mazin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-14

Beschreibung: Author(s): J. K. Glasbrenner and I. I. Mazin The compound BaFe2As2 is the proptotypical example of the 122 family of high-Tc Fe-based superconductors that crystallize in the ThCr2Si2 structure. Isostructural compounds can be formed by replacing Fe with another transition metal; using Mn produces the material BaMn2As2, which unlike its Fe-based... [Phys. Rev. B 89, 060403] Published Thu Feb 13, 2014

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Spin-lattice relaxation via quantum tunneling in diluted crystals of Fe4 single-molecule magnets (2014)

A. Repollés, A. Cornia, and F. Luis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-27

Beschreibung: Author(s): A. Repollés, A. Cornia, and F. Luis We investigate the dynamic susceptibility of Fe4 single-molecule magnets with integer spin (S=5) in the form of pure crystals as well as diluted in crystals of isostructural, but nonmagnetic, Ga4 clusters. Below approximately 1 K, the spin-lattice relaxation becomes dominated by a temperature-indepe... [Phys. Rev. B 89, 054429] Published Wed Feb 26, 2014

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Magnetic ordering with reduced cerium moments in hole-doped CeOs2Al10 (2014)

D. D. Khalyavin, D. T. Adroja, A. Bhattacharyya, A. D. Hillier, P. Manuel, A. M. Strydom, J. Kawabata, and T. Takabatake

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-27

Beschreibung: Author(s): D. D. Khalyavin, D. T. Adroja, A. Bhattacharyya, A. D. Hillier, P. Manuel, A. M. Strydom, J. Kawabata, and T. Takabatake The lightly hole-doped system CeOs1.94Re0.06Al10 has been studied by muon spin relaxation and neutron diffraction measurements. A long-range antiferromagnetic ordering of the Ce sublattice with a substantially reduced value of the magnetic moment 0.18(1)μB has been found below TN=21 K. Similar to th... [Phys. Rev. B 89, 064422] Published Wed Feb 26, 2014

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Intrinsic reduction of the ordered 4f magnetic moments in semiconducting rare-earth nitride thin films: DyN, ErN, and HoN (2014)

D. L. Cortie, J. D. Brown, S. Brück, T. Saerbeck, J. P. Evans, H. Fritzsche, X. L. Wang, J. E. Downes, and F. Klose

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-27

Beschreibung: Author(s): D. L. Cortie, J. D. Brown, S. Brück, T. Saerbeck, J. P. Evans, H. Fritzsche, X. L. Wang, J. E. Downes, and F. Klose Polarized neutron reflectometry and x-ray reflectometry were used to determine the nanoscale magnetic and chemical depth profiles of the heavy rare-earth nitrides HoN, ErN, and DyN in the form of 15- to 40-nm-thick films. The net ferromagnetic components are much lower than the predictions of densit... [Phys. Rev. B 89, 064424] Published Wed Feb 26, 2014

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Intrinsic paramagnetism and aggregation of manganese dopants in SrTiO3 (2014)

A. Zorko, M. Pregelj, H. Luetkens, A.-K. Axelsson, and M. Valant

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): A. Zorko, M. Pregelj, H. Luetkens, A.-K. Axelsson, and M. Valant Using local-probe magnetic-characterization techniques of muon spin relaxation and electron spin resonance we have investigated the Mn-induced magnetism of the wide-band-gap perovskite SrTiO3. Our results clearly demonstrate that this diluted magnetic oxide remains paramagnetic down to low temperatu... [Phys. Rev. B 89, 094418] Published Thu Mar 20, 2014

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Electric field control and effect of Pd capping on magnetocrystalline anisotropy in FePd thin films: A first-principles study (2014)

P. V. Ong, Nicholas Kioussis, P. Khalili Amiri, J. G Alzate, K. L. Wang, Gregory P. Carman, Jun Hu, and Ruqian Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-25

Beschreibung: Author(s): P. V. Ong, Nicholas Kioussis, P. Khalili Amiri, J. G Alzate, K. L. Wang, Gregory P. Carman, Jun Hu, and Ruqian Wu Using ab initio electronic structure calculations, we have investigated the effect of an electric field and of a heavy-metal cap of Pd on the magnetocrystalline anisotropy (MCA) of FePd ultrathin film. Analysis of the energy- and k-resolved distribution of the orbital character of the minority-spin ... [Phys. Rev. B 89, 094422] Published Mon Mar 24, 2014

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Thermal control of the spin pumping damping in ferromagnetic/normal metal interfaces (2014)

S. M. Rezende, R. L. Rodríguez-Suárez, and A. Azevedo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-25

Beschreibung: Author(s): S. M. Rezende, R. L. Rodríguez-Suárez, and A. Azevedo A model is presented for the control of the magnetic relaxation in a ferromagnetic insulator (FMI) in contact with a normal metal (NM) under a thermal gradient applied across the thickness of the bilayer. We show that the thermal gradient modifies the spin pumping damping created by the contact of t... [Phys. Rev. B 89, 094423] Published Mon Mar 24, 2014

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Series of phase transitions and multiferroicity in the quasi-two-dimensional spin-12 triangular-lattice antiferromagnet Ba3CoNb2O9 (2014)

M. Lee, J. Hwang, E. S. Choi, J. Ma, C. R. Dela Cruz, M. Zhu, X. Ke, Z. L. Dun, and H. D. Zhou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-25

Beschreibung: Author(s): M. Lee, J. Hwang, E. S. Choi, J. Ma, C. R. Dela Cruz, M. Zhu, X. Ke, Z. L. Dun, and H. D. Zhou We have investigated the magnetic and electric ground states of a quasi-two-dimensional triangular lattice antiferromagnet (TLAF), Ba3CoNb2O9, in which the effective spin of Co2+ is 1/2. At zero field, the system undergoes a two-step transition upon cooling at TN2=1.36 K and TN1=1.10 K and enters a ... [Phys. Rev. B 89, 104420] Published Mon Mar 24, 2014

Schlagwort(e): Magnetism

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Magnetic structure and properties of orthorhombic Li2Ni(SO4)2: A possible magnetoelectric material (2014)

Marine Reynaud, Juan Rodríguez-Carvajal, Jean-Noël Chotard, Jean-Marie Tarascon, and Gwenaëlle Rousse

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-25

Beschreibung: Author(s): Marine Reynaud, Juan Rodríguez-Carvajal, Jean-Noël Chotard, Jean-Marie Tarascon, and Gwenaëlle Rousse In this paper, we report on the structural and magnetic properties, as deduced from susceptibility measurements and neutron powder diffraction experiments, of an orthorhombic nickel disulfate, Li2Ni(SO4)2. This phase presents NiO6 octahedra linked via SO4 groups only, leading to an antiferromagnetic... [Phys. Rev. B 89, 104419] Published Mon Mar 24, 2014

Schlagwort(e): Magnetism

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Magnetization switching through spin-Hall-effect-induced chiral domain wall propagation (2014)

Guoqiang Yu, Pramey Upadhyaya, Kin L. Wong, Wanjun Jiang, Juan G. Alzate, Jianshi Tang, Pedram Khalili Amiri, and Kang L. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-26

Beschreibung: Author(s): Guoqiang Yu, Pramey Upadhyaya, Kin L. Wong, Wanjun Jiang, Juan G. Alzate, Jianshi Tang, Pedram Khalili Amiri, and Kang L. Wang The influence of spin-Hall-effect spin torque (SHE-ST) induced by in-plane charge current was studied in microscale Ta/Co20Fe60B20/TaOx films with perpendicular magnetization. Simultaneous electrical transport and polar magneto-optical Kerr effect (MOKE) imaging experiments were used to investigate ... [Phys. Rev. B 89, 104421] Published Tue Mar 25, 2014

Schlagwort(e): Magnetism

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Parametric pumping of precession modes in ferromagnetic nanodisks (2014)

Feng Guo, L. M. Belova, and R. D. McMichael

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-27

Beschreibung: Author(s): Feng Guo, L. M. Belova, and R. D. McMichael We report on the parametric excitation of magnetic precession modes in nanodisks using a parallel pumping configuration. The excitations are detected using a ferromagnetic resonance force microscopy method, and the parallel-pumped spectra reveal nonlinear characteristics including instability thresh... [Phys. Rev. B 89, 104422] Published Wed Mar 26, 2014

Schlagwort(e): Magnetism

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N (2014)

F. B. Ramos and J. C. Xavier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-28

Beschreibung: Author(s): F. B. Ramos and J. C. Xavier We investigate the N-leg spin-S Heisenberg ladders by using the density matrix renormalization group method. We present estimates of the spin gap Δs and of the ground-state energy per site e∞N in the thermodynamic limit for ladders with widths up to six legs and spin S≤52. We also estimate the groun... [Phys. Rev. B 89, 094424] Published Thu Mar 27, 2014

Schlagwort(e): Magnetism

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Phase diagram of the frustrated quantum-XY model on the honeycomb lattice studied by series expansions: Evidence for proximity to a bicritical point (2014)

J. Oitmaa and R. R. P. Singh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-28

Beschreibung: Author(s): J. Oitmaa and R. R. P. Singh We study the nearest-neighbor exchange (J1) and second-nearest-neighbor exchange (J2) XY antiferromagnet on the honeycomb lattice using ground state series expansions around Néel, columnar, and dimer phases. The conventional two-sublattice XY Néel order at small J2 vanishes at J2/J1=0.22±0.01 in agr... [Phys. Rev. B 89, 104423] Published Thu Mar 27, 2014

Schlagwort(e): Magnetism

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Strong out-of-plane magnetic anisotropy of Fe adatoms on Bi2Te3 (2014)

T. Eelbo, M. Waśniowska, M. Sikora, M. Dobrzański, A. Kozłowski, A. Pulkin, G. Autès, I. Miotkowski, O. V. Yazyev, and R. Wiesendanger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-29

Beschreibung: Author(s): T. Eelbo, M. Waśniowska, M. Sikora, M. Dobrzański, A. Kozłowski, A. Pulkin, G. Autès, I. Miotkowski, O. V. Yazyev, and R. Wiesendanger The electronic and magnetic properties of individual Fe atoms adsorbed on the surface of the topological insulator Bi2Te3(111) are investigated. Scanning tunneling microscopy and spectroscopy prove the existence of two distinct types of Fe species, while our first-principles calculations assign them... [Phys. Rev. B 89, 104424] Published Fri Mar 28, 2014

Schlagwort(e): Magnetism

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Momentum space anisotropy of electronic correlations in Fe and Ni: An analysis of magnetic Compton profiles (2014)

L. Chioncel, D. Benea, H. Ebert, I. Di Marco, and J. Minár

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): L. Chioncel, D. Benea, H. Ebert, I. Di Marco, and J. Minár The total and magnetically resolved Compton profiles are analyzed within the combined density functional and dynamical mean-field theory for the transition-metal elements Fe and Ni. A rather good agreement between the measured and computed magnetic Compton profiles of Fe and Ni is obtained with the ... [Phys. Rev. B 89, 094425] Published Mon Mar 31, 2014

Schlagwort(e): Magnetism

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Pinned magnetic moments in exchange bias: Role of the antiferromagnetic bulk spin structure (2014)

M. Yaqoob Khan, Chii-Bin Wu (吳啟彬), and Wolfgang Kuch

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): M. Yaqoob Khan, Chii-Bin Wu (吳啟彬), and Wolfgang Kuch Magneto-optical Kerr effect measurements of epitaxial AFM/FM bilayers and FM/AFM/FM trilayers on Cu3Au(001), where “AFM” stands for a Ni25Mn75 antiferromagnetic layer, and “FM” for ferromagnetic layers that are either Ni or Ni/Co with out-of-plane or in-plane easy axis of magnetization, show that tr... [Phys. Rev. B 89, 094427] Published Mon Mar 31, 2014

Schlagwort(e): Magnetism

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Photoinduced spin angular momentum transfer into an antiferromagnetic insulator (2014)

Y. Fan, X. Ma, F. Fang, J. Zhu, Q. Li, T. P. Ma, Y. Z. Wu, Z. H. Chen, H. B. Zhao, and G. Lüpke

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): Y. Fan, X. Ma, F. Fang, J. Zhu, Q. Li, T. P. Ma, Y. Z. Wu, Z. H. Chen, H. B. Zhao, and G. Lüpke Spin angular momentum transfer into an antiferromagnetic (AFM) insulator is observed in a single-crystalline Fe/CoO/MgO(001) heterostructure by time-resolved magneto-optical Kerr effect. The transfer process is mediated by the Heisenberg exchange coupling between Fe and CoO spins. Spin angular momen... [Phys. Rev. B 89, 094428] Published Mon Mar 31, 2014

Schlagwort(e): Magnetism

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