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MgFeGe as an isoelectronic and isostructural analog of the superconductor LiFeAs (2012)

Xiaofeng Liu, Satoru Matsuishi, Satoru Fujitsu, and Hideo Hosono

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): Xiaofeng Liu, Satoru Matsuishi, Satoru Fujitsu, and Hideo Hosono MgFeGe with a CeFeSi-type structure was synthesized by high-pressure method, and its electrical transport, magnetic properties, and electronic structure were investigated. It is found that MgFeGe has the smallest c / a (1.65) ratio and the shortest in-plane Fe-Fe distance (2.75 Å) among CeFeSi-type an... [Phys. Rev. B 85, 104403] Published Thu Mar 08, 2012

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Optimization of magnetic flux density in electrical steels: Slater-Pauling pattern repetition in multicomponent alloys (2012)

Seung Su Baik, S. K. Kwon, and B. I. Min

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-25

Description: Author(s): Seung Su Baik, S. K. Kwon, and B. I. Min By investigating the magnetization variation of Fe-rich multicomponent alloys with solute concentration, the magnetic flux density of Si electrical steel is optimized with average valency. For binary alloys of Fe - X [ X = d – 5 d transition-metal (TM) and 3 s p – 6 s p elements], the usual mountain-shape behavio... [Phys. Rev. B 85, 052402] Published Fri Feb 24, 2012

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Tailoring of magnetism in Pt/Co/Pt ultrathin films by ion irradiation (2012)

A. Maziewski, P. Mazalski, Z. Kurant, M. O. Liedke, J. McCord, J. Fassbender, J. Ferré, A. Mougin, A. Wawro, L. T. Baczewski, A. Rogalev, F. Wilhelm, and T. Gemming

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-25

Description: Author(s): A. Maziewski, P. Mazalski, Z. Kurant, M. O. Liedke, J. McCord, J. Fassbender, J. Ferré, A. Mougin, A. Wawro, L. T. Baczewski, A. Rogalev, F. Wilhelm, and T. Gemming Magnetization orientation in Ga + -irradiated Pt/Co( d Co )/Pt ultrathin films can be changed in a controlled way by adjusting the ion fluence, F . Two-dimensional ( d Co , F ) diagrams of magnetic and magneto-optical properties have been derived. Distinct out-of-plane magnetic anisotropy states with enhanced... [Phys. Rev. B 85, 054427] Published Fri Feb 24, 2012

Keywords: Magnetism

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Formation and coarsening of the concertina magnetization pattern in elongated thin-film elements (2012)

Jutta Steiner, Rudolf Schäfer, Holm Wieczoreck, Jeffrey McCord, and Felix Otto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Jutta Steiner, Rudolf Schäfer, Holm Wieczoreck, Jeffrey McCord, and Felix Otto The concertina is a magnetization pattern in elongated thin-film elements of a soft ferromagnetic material. It is a ubiquitous domain pattern that occurs in the process of magnetization reversal in the direction of the long axis of the small element. Van den Berg and Vatvani [ IEEE Trans. Magn. 18 ... [Phys. Rev. B 85, 104407] Published Mon Mar 12, 2012

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High-temperature series expansion study of the Heisenberg antiferromagnet on the hyperkagome lattice: Comparison with Na_{4}Ir_{3}O_{8} (2012)

R. R. P. Singh and J. Oitmaa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): R. R. P. Singh and J. Oitmaa We develop high-temperature series expansions for ln Z and the uniform structure factor of the spin-half Heisenberg model on the hyperkagome lattice to the order of β 16 . These expansions are used to calculate the uniform susceptibility ( χ ), the entropy ( S ), and the heat capacity ( C ) of the model as ... [Phys. Rev. B 85, 104406] Published Mon Mar 12, 2012

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Theoretical investigation of the inverse Faraday effect via a stimulated Raman scattering process (2012)

Daria Popova, Andreas Bringer, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Daria Popova, Andreas Bringer, and Stefan Blügel We study theoretically the origin and mechanism of the ultrafast inverse Faraday effect, which is a magneto-optical effect, attracting much interest nowadays. Laser-induced subpicosecond spin dynamics in hydrogenlike systems and isolated many-electron atoms are investigated in order to get insight i... [Phys. Rev. B 85, 094419] Published Wed Mar 14, 2012

Keywords: Magnetism

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Intrinsic defects in multiferroic BiFeO_{3} and their effect on magnetism (2012)

Tula R. Paudel, Sitaram S. Jaswal, and Evgeny Y. Tsymbal

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Tula R. Paudel, Sitaram S. Jaswal, and Evgeny Y. Tsymbal We investigate the energetics of the intrinsic defects in bulk multiferroic BiFeO 3 and explore their implication for magnetization using a first-principles approach based on density functional theory. We find that the dominant defects in oxidizing (oxygen-rich) conditions are Bi and Fe vacancies and... [Phys. Rev. B 85, 104409] Published Wed Mar 14, 2012

Keywords: Magnetism

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Surface spin polarization of the nonstoichiometric Heusler alloy Co_{2}MnSi (2012)

Jan-Peter Wüstenberg, Roman Fetzer, Martin Aeschlimann, Mirko Cinchetti, Jan Minár, Jürgen Braun, Hubert Ebert, Takayuki Ishikawa, Tetsuya Uemura, and Masafumi Yamamoto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-16

Description: Author(s): Jan-Peter Wüstenberg, Roman Fetzer, Martin Aeschlimann, Mirko Cinchetti, Jan Minár, Jürgen Braun, Hubert Ebert, Takayuki Ishikawa, Tetsuya Uemura, and Masafumi Yamamoto Using a combined approach of spin-resolved photoemission spectroscopy, band structure and photoemission calculations we investigate the influence of bulk defects and surface states on the spin polarization of nonstoichiometric Co 2 Mn α Si thin films (with α =0.69 and α =1.19 ) with bulk L 2 1 order. We find... [Phys. Rev. B 85, 064407] Published Wed Feb 15, 2012

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Dynamics of successive minor hysteresis loops (2012)

Y. W. Windsor, A. Gerber, and M. Karpovski

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-18

Description: Author(s): Y. W. Windsor, A. Gerber, and M. Karpovski Cumulative growth of successive minor hysteresis loops in Co/Pd multilayers with perpendicular anisotropy was studied in the context of time-dependent magnetization reversal dynamics. We show that in disordered ferromagnets, where magnetization reversal involves nucleation, domains’ expansion, and d... [Phys. Rev. B 85, 064409] Published Fri Feb 17, 2012

Keywords: Magnetism

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Magnetic phase diagram of the frustrated S=1/2 chain magnet LiCu_{2}O_{2} (2012)

A. A. Bush, V. N. Glazkov, M. Hagiwara, T. Kashiwagi, S. Kimura, K. Omura, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): A. A. Bush, V. N. Glazkov, M. Hagiwara, T. Kashiwagi, S. Kimura, K. Omura, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev We present the results of the magnetization and dielectric constant measurements on untwinned single-crystal samples of the frustrated S =1/2 chain cuprate LiCu 2 O 2 . Magnetic phase transitions were observed. A spin-flop transition of the spiral spin plane was observed for the field orientations H ∥ a , b ... [Phys. Rev. B 85, 054421] Published Tue Feb 21, 2012

Keywords: Magnetism

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Single-crystal study of the kagome antiferromagnet U_{3}Ru_{4}Al_{12} (2012)

R. Troć, M. Pasturel, O. Tougait, A. P. Sazonov, A. Gukasov, C. Sułkowski, and H. Noël

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): R. Troć, M. Pasturel, O. Tougait, A. P. Sazonov, A. Gukasov, C. Sułkowski, and H. Noël A ternary intermetallic compound, U 3 Ru 4 Al 12 in a single-crystal form, was studied by measurement of susceptibility, magnetization, electrical resistivity, magnetoresistivity, thermopower, and heat capacity, as well as neutron diffraction, revealing that this aluminide is an antiferromagnetically ord... [Phys. Rev. B 85, 064412] Published Tue Feb 21, 2012

Keywords: Magnetism

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Quantum phase transition in Heisenberg-Kitaev model (2012)

Robert Schaffer, Subhro Bhattacharjee, and Yong Baek Kim

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): Robert Schaffer, Subhro Bhattacharjee, and Yong Baek Kim We explore the nature of the quantum phase transition between a magnetically ordered state with collinear spin pattern and a gapless Z 2 spin liquid in the Heisenberg-Kitaev model. We construct a slave particle mean-field theory for the Heisenberg-Kitaev model in terms of complex fermionic spinons. I... [Phys. Rev. B 86, 224417] Published Fri Dec 21, 2012

Keywords: Magnetism

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Longitudinal and transverse static spin fluctuations in layered ferromagnets and antiferromagnets (2012)

A. Katanin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): A. Katanin We analyze the momentum dependence of static susceptibilities of layered local-moment systems below Curie (Neel) temperature within the 1/ S expansion, the renormalization-group (RG) approach, and the first order of the 1/ N expansion. We argue that already at sufficiently low temperatures the previou... [Phys. Rev. B 86, 224416] Published Fri Dec 21, 2012

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Magnetic behavior of dense nanoparticle assemblies: Interplay of interparticle interactions and particle system morphology (2012)

G. Margaris, K. N. Trohidou, V. Iannotti, G. Ausanio, L. Lanotte, and D. Fiorani

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): G. Margaris, K. N. Trohidou, V. Iannotti, G. Ausanio, L. Lanotte, and D. Fiorani The role of interparticle interactions and the morphology in the magnetic behavior of dense assemblies of Fe nanoparticles with concentration well above the percolation threshold has been studied using the Monte Carlo simulations technique. The initial and temperature-dependent magnetization curves ... [Phys. Rev. B 86, 214425] Published Wed Dec 26, 2012

Keywords: Magnetism

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Coherent sliding dynamics and spin motive force driven by crossed magnetic fields in a chiral helimagnet (2012)

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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Publication Date: 2012-12-27

Description: Author(s): Jun-ichiro Kishine, I. G. Bostrem, A. S. Ovchinnikov, and Vl. E. Sinitsyn We demonstrate that the chiral soliton lattice formed from a chiral helimagnet exhibits a coherent sliding motion when a time-dependent magnetic field is applied parallel to the helical axis, in addition to a static field perpendicular to the helical axis. To describe the coherent sliding, we use th... [Phys. Rev. B 86, 214426] Published Wed Dec 26, 2012

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Dynamic off-centering of Cr^{3+} ions and short-range magneto-electric clusters in CdCr_{2}S_{4} (2012)

G. N. P. Oliveira, A. M. Pereira, A. M. L. Lopes, J. S. Amaral, A. M. dos Santos, Y. Ren, T. M. Mendonça, C. T. Sousa, V. S. Amaral, J. G. Correia, and J. P. Araújo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): G. N. P. Oliveira, A. M. Pereira, A. M. L. Lopes, J. S. Amaral, A. M. dos Santos, Y. Ren, T. M. Mendonça, C. T. Sousa, V. S. Amaral, J. G. Correia, and J. P. Araújo The cubic spinel CdCr 2 S 4 gained recently a vivid interest, given the relevance of relaxor-like dielectric behavior in its paramagnetic phase. By a singular combination of local probe techniques, namely, pair distribution function and perturbed angular correlation, we firmly establish that the Cr ion... [Phys. Rev. B 86, 224418] Published Wed Dec 26, 2012

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Organic magnetic tunnel junctions: The role of metal-molecule interface (2012)

S. H. Liang, D. P. Liu, L. L. Tao, X. F. Han, and Hong Guo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): S. H. Liang, D. P. Liu, L. L. Tao, X. F. Han, and Hong Guo We report a first-principles theoretical investigation of spin-polarized quantum transport in organic magnetic tunnel junctions (OMTJs) to provide a microscopic understanding on the sign of the tunnel magnetoresistance ratio (TMR). We consider two different OMTJs, formed by sandwiching 1-stearic aci... [Phys. Rev. B 86, 224419] Published Wed Dec 26, 2012

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Giant magnetic anisotropy in Mn_{3}O_{4} investigated by ^{55}Mn^{2+} and ^{55}Mn^{3+} NMR (2012)

Changsoo Kim, Euna Jo, Byeongki Kang, Sangil Kwon, Soonchil Lee, Jeong Hyun Shim, Takehiko Suzuki, and Takuro Katsufuji

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): Changsoo Kim, Euna Jo, Byeongki Kang, Sangil Kwon, Soonchil Lee, Jeong Hyun Shim, Takehiko Suzuki, and Takuro Katsufuji In Mn 3 O 4 , the magnetization along the c axis is different from that along the a b plane even in the strong field of 30 T. To investigate the origin of the huge magnetic anisotropy, Mn 2+ and Mn 3+ nuclear magnetic resonance spectra were measured in the 7-T magnetic field. The canting angle of the magne... [Phys. Rev. B 86, 224420] Published Wed Dec 26, 2012

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Ho and Fe magnetic ordering in multiferroic HoFe_{3}(BO_{3})_{4} (2012)

D. K. Shukla, S. Francoual, A. Skaugen, M. v. Zimmermann, H. C. Walker, L. N. Bezmaternykh, I. A. Gudim, V. L. Temerov, and J. Strempfer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): D. K. Shukla, S. Francoual, A. Skaugen, M. v. Zimmermann, H. C. Walker, L. N. Bezmaternykh, I. A. Gudim, V. L. Temerov, and J. Strempfer Resonant and nonresonant x-ray scattering studies on HoFe 3 (BO 3 ) 4 reveal competing magnetic ordering of Ho and Fe moments. Temperature and x-ray polarization dependent measurements employed at the Ho L 3 edge directly reveal a spiral spin order of the induced Ho moments in the a b plane propagating alo... [Phys. Rev. B 86, 224421] Published Wed Dec 26, 2012

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Magnetic structure of ground and field-induced ordered states of low-dimensional α-CoV_{2}O_{6}: Experiment and theory (2012)

M. Lenertz, J. Alaria, D. Stoeffler, S. Colis, A. Dinia, O. Mentré, G. André, F. Porcher, and E. Suard

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): M. Lenertz, J. Alaria, D. Stoeffler, S. Colis, A. Dinia, O. Mentré, G. André, F. Porcher, and E. Suard In this work, we investigate the magnetic properties of the monoclinic α -CoV 2 O 6 by powder neutron diffraction measurements and ab initio calculations. An emphasis has been pointed towards the magnetic structure and the interaction between the Co ions leading to magnetic frustrations in this compound... [Phys. Rev. B 86, 214428] Published Fri Dec 28, 2012

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High-temperature onset of field-induced transitions in the spin-ice compound Dy_{2}Ti_{2}O_{7} (2012)

M. J. Matthews, C. Castelnovo, R. Moessner, S. A. Grigera, D. Prabhakaran, and P. Schiffer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-20

Description: Author(s): M. J. Matthews, C. Castelnovo, R. Moessner, S. A. Grigera, D. Prabhakaran, and P. Schiffer We have studied the field-dependent ac magnetic susceptibility of single crystals of Dy 2 Ti 2 O 7 spin ice along the [111] direction in the temperature range 1.8–7 K. Our data reflect the onset of local spin-ice order in the appearance of different field regimes. In particular, we observe a prominent fe... [Phys. Rev. B 86, 214419] Published Wed Dec 19, 2012

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First-principles investigation of the magnetic anisotropy and magnetic properties of Co/Ni(111) superlattices (2012)

F. Gimbert and L. Calmels

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-08

Description: Author(s): F. Gimbert and L. Calmels We used first-principles methods to calculate the electronic and magnetic structure of Co/Ni(111) superlattices with a thickness of the Co and Ni layers ranging from one to four monolayers. We give a detailed database on the magnetocrystalline anisotropy energy induced by interfaces and on the total... [Phys. Rev. B 86, 184407] Published Wed Nov 07, 2012

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Competing interactions at the interface between ferromagnetic oxides revealed by spin-polarized neutron reflectometry (2012)

J.-H. Kim, I. Vrejoiu, Y. Khaydukov, T. Keller, J. Stahn, A. Rühm, D. K. Satapathy, V. Hinkov, and B. Keimer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-09

Description: Author(s): J.-H. Kim, I. Vrejoiu, Y. Khaydukov, T. Keller, J. Stahn, A. Rühm, D. K. Satapathy, V. Hinkov, and B. Keimer We have investigated the magnetization profiles in superlattices composed of the two ferromagnets La 0.7 Sr 0.3 MnO 3 and SrRuO 3 using spin-polarized neutron reflectometry. In combination with magnetometry, the neutron data indicate a noncollinear spin configuration where orientation of the Ru moments ch... [Phys. Rev. B 86, 180402] Published Thu Nov 08, 2012

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Determining the planar Nernst effect from magnetic-field-dependent thermopower and resistance in nickel and permalloy thin films (2012)

A. D. Avery, M. R. Pufall, and B. L. Zink

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-09

Description: Author(s): A. D. Avery, M. R. Pufall, and B. L. Zink We present magnetic-field-dependent measurements of thermopower, α (H), and resistance, R ( H ), for Ni 80 Fe 20 and Ni thin films. We conducted these experiments in fields oriented parallel and perpendicular to the applied thermal gradient, ∇ ⃗ T , for α (H) and applied current for R ( H ). We deposited the 20-n... [Phys. Rev. B 86, 184408] Published Thu Nov 08, 2012

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Importance of exchange anisotropy and superexchange for the spin-state transitions in RCoO_{3} (R= rare earth) cobaltates (2012)

Guoren Zhang, Evgeny Gorelov, Erik Koch, and Eva Pavarini

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Guoren Zhang, Evgeny Gorelov, Erik Koch, and Eva Pavarini Spin-state transitions are the hallmark of rare-earth cobaltates. In order to understand them, it is essential to identify all relevant parameters which shift the energy balance between spin states and determine their trends. We find that Δ , the e g - t 2 g crystal-field splitting, increases by ∼250 meV ... [Phys. Rev. B 86, 184413] Published Mon Nov 12, 2012

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Mutual induction of magnetic 3d and 4f order in multiferroic hexagonal ErMnO_{3} (2012)

D. Meier, H. Ryll, K. Kiefer, B. Klemke, J.-U. Hoffmann, R. Ramesh, and M. Fiebig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): D. Meier, H. Ryll, K. Kiefer, B. Klemke, J.-U. Hoffmann, R. Ramesh, and M. Fiebig The complex interplay between the 3 d and 4 f moments in hexagonal ErMnO 3 is investigated by magnetization, optical second harmonic generation, and neutron-diffraction measurements. We revise the phase diagram and provide a microscopic model for the emergent spin structures, with a special focus on th... [Phys. Rev. B 86, 184415] Published Mon Nov 12, 2012

Keywords: Magnetism

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Thermalization of magnons in yttrium-iron garnet: Nonequilibrium functional renormalization group approach (2012)

Johannes Hick, Thomas Kloss, and Peter Kopietz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-15

Description: Author(s): Johannes Hick, Thomas Kloss, and Peter Kopietz Using a nonequilibrium functional renormalization group (FRG) approach we calculate the time evolution of the momentum distribution of a magnon gas in contact with a thermal phonon bath. As a cutoff for the FRG procedure we use a hybridization parameter Λ giving rise to an artificial damping of the ... [Phys. Rev. B 86, 184417] Published Wed Nov 14, 2012

Keywords: Magnetism

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Low-energy effective theory and two distinct critical phases in a spin-1/2 frustrated three-leg spin tube (2012)

Yang Zhao, Shou-Shu Gong, Yong-Jun Wang, and Gang Su

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-08

Description: Author(s): Yang Zhao, Shou-Shu Gong, Yong-Jun Wang, and Gang Su Motivated by the crystal structures of [(CuCl 2 tachH) 3 Cl]Cl 2 and Ca 3 Co 2 O 6 , we develop a low-energy effective theory using the bosonization technique for a spin-1/2 frustrated three-leg spin tube with trigonal prism units in two limit cases. The features obtained with the effective theory are numerica... [Phys. Rev. B 86, 224406] Published Fri Dec 07, 2012

Keywords: Magnetism

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Excitations in a quantum spin liquid with random bonds (2012)

D. Hüvonen, S. Zhao, G. Ehlers, M. Månsson, S. N. Gvasaliya, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): D. Hüvonen, S. Zhao, G. Ehlers, M. Månsson, S. N. Gvasaliya, and A. Zheludev We present the results of an inelastic neutron-scattering study on two bond disordered quasi-two-dimensional quantum magnets (C 4 H 12 N 2 )Cu 2 (Cl 1− x Br x ) 6 with x =0.035 and 0.075. We observe an increase of spin gap, a reduction of magnon bandwidth, and a decrease of magnon lifetimes compared to the x =0 sam... [Phys. Rev. B 86, 214408] Published Mon Dec 10, 2012

Keywords: Magnetism

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Canted antiferromagnetism on a nanodimensional spherical surface geometry: The case of MnCO_{3} small hollow nanospheres (2012)

Jin Bae Lee, Won G. Hong, Hae Jin Kim, Z. Jagličić, S. Jazbec, M. Wencka, A. Jelen, and J. Dolinšek

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Jin Bae Lee, Won G. Hong, Hae Jin Kim, Z. Jagličić, S. Jazbec, M. Wencka, A. Jelen, and J. Dolinšek Canted antiferromagnetism on a nanodimensional spherical surface geometry was investigated on manganese carbonate MnCO 3 small hollow nanospheres of mean diameter 7.0 ± 0.3 nm and shell thickness of 0.7 nm, by performing magnetic measurements and specific heat study, in comparison to the bulk form of... [Phys. Rev. B 86, 224407] Published Mon Dec 10, 2012

Keywords: Magnetism

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Influence of Dzyaloshinskii-Moriya interactions on magnetic structure of a spin-1/2 deformed kagome lattice antiferromagnet (2012)

Kyusung Hwang, Kwon Park, and Yong Baek Kim

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Kyusung Hwang, Kwon Park, and Yong Baek Kim Motivated by the recent neutron-scattering experiment on Rb 2 Cu 3 SnF 12 [ Nature Phys. 6 865 (2010) ], we investigate the effect of Dzyaloshinskii-Moriya interactions in a theoretical model for the magnetic structure of this material. Considering the valence bond solid ground state, which has a 12-site... [Phys. Rev. B 86, 214407] Published Mon Dec 10, 2012

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Sign of the superexchange coupling between next-nearest neighbors in EuO (2012)

Pan Liu, Juan A.Colón Santana, Qilin Dai, Xianjie Wang, Peter A. Dowben, and Jinke Tang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Pan Liu, Juan A.Colón Santana, Qilin Dai, Xianjie Wang, Peter A. Dowben, and Jinke Tang The sign of the superexchange coupling J 2 between next-nearest neighboring Eu 2+ magnetic moments in EuO is a matter subject to debate. We have obtained evidence that this coupling is of antiferromagnetic nature ( J 2 〈0). EuO thin films grown at different temperatures suggest that lattice expansion ... [Phys. Rev. B 86, 224408] Published Mon Dec 10, 2012

Keywords: Magnetism

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Field-induced polar order at the Néel temperature of chromium in rare-earth orthochromites: Interplay of rare-earth and Cr magnetism (2012)

B. Rajeswaran, D. I. Khomskii, A. K. Zvezdin, C. N. R. Rao, and A. Sundaresan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): B. Rajeswaran, D. I. Khomskii, A. K. Zvezdin, C. N. R. Rao, and A. Sundaresan We report field-induced switchable polarization ( P ∼ 0.2–0.8 μC/cm 2 ) below the Néel temperature of chromium ( T N Cr ) in weakly ferromagnetic rare-earth orthochromites, R CrO 3 ( R = rare earth) but only when the rare-earth ion is magnetic. Intriguingly, the polarization in ErCrO 3 ( T C = 133 K) disappears ... [Phys. Rev. B 86, 214409] Published Mon Dec 10, 2012

Keywords: Magnetism

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Exotic continuous quantum phase transition between Z_{2} topological spin liquid and Néel order (2012)

Eun-Gook Moon and Cenke Xu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): Eun-Gook Moon and Cenke Xu Recent numerical simulations with different techniques have all suggested the existence of a continuous quantum phase transition between the Z 2 topological spin-liquid phase and a conventional Néel order. Motivated by this numerical progress, we propose a candidate theory for such Z 2 -Néel transition... [Phys. Rev. B 86, 214414] Published Mon Dec 17, 2012

Keywords: Magnetism

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Temperature dependence of the frequencies and effective damping parameters of ferrimagnetic resonance (2012)

F. Schlickeiser, U. Atxitia, S. Wienholdt, D. Hinzke, O. Chubykalo-Fesenko, and U. Nowak

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): F. Schlickeiser, U. Atxitia, S. Wienholdt, D. Hinzke, O. Chubykalo-Fesenko, and U. Nowak Recent experiments on all-optical switching in GdFeCo and CoGd have raised the question about the importance of the angular momentum or the magnetization compensation point for ultrafast magnetization dynamics. We investigate the dynamics of ferrimagnets by means of computer simulations as well as a... [Phys. Rev. B 86, 214416] Published Mon Dec 17, 2012

Keywords: Magnetism

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Magnetic order induced by Fe substitution of Al site in the heavy-fermion systems α-YbAlB_{4} and β-YbAlB_{4} (2012)

Kentaro Kuga, Gregory Morrison, La; Rico Treadwell, Julia Y. Chan, and Satoru Nakatsuji

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): Kentaro Kuga, Gregory Morrison, LaRico Treadwell, Julia Y. Chan, and Satoru Nakatsuji β -YbAlB 4 is a heavy-fermion superconductor that exhibits a quantum criticality without tuning at zero field and under ambient pressure. We have succeeded in substituting Fe for Al in β -YbAlB 4 as well as the polymorphous compound α -YbAlB 4 , which in contrast has a heavy Fermi-liquid ground state. Full... [Phys. Rev. B 86, 224413] Published Mon Dec 17, 2012

Keywords: Magnetism

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Magnetization reversal in Ni/FeF_{2} heterostructures with the coexistence of positive and negative exchange bias (2012)

Miroslavna Kovylina, Rafael Morales, Amílcar Labarta, and Xavier Batlle

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): Miroslavna Kovylina, Rafael Morales, Amílcar Labarta, and Xavier Batlle Magnetization reversal mechanisms are studied in Ni/FeF 2 heterostructures with the coexistence of positive and negative exchanged bias (PEB/NEB), showing single and double hysteresis loops (DHL) in magnetoresistance measurements. Micromagnetic simulations show that PEB and NEB domains of a minimum c... [Phys. Rev. B 86, 224414] Published Mon Dec 17, 2012

Keywords: Magnetism

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Theory of orbital magnetization in disordered systems (2012)

Guobao Zhu, Shengyuan A. Yang, Cheng Fang, W. M. Liu, and Yugui Yao

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): Guobao Zhu, Shengyuan A. Yang, Cheng Fang, W. M. Liu, and Yugui Yao We present a general formula of the orbital magnetization of disordered systems based on the Keldysh Green's function theory in the gauge-covariant Wigner space. In our approach, the gauge invariance of physical quantities is ensured from the very beginning, and the vertex corrections are easily inc... [Phys. Rev. B 86, 214415] Published Mon Dec 17, 2012

Keywords: Magnetism

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Testing the transverse field Ising model in LiHoF_{4} using capacitive dilatometry (2012)

J. L. Dunn, C. Stahl, A. J. Macdonald, Kevin Liu, Y. Reshitnyk, W. Sim, and R. W. Hill

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): J. L. Dunn, C. Stahl, A. J. Macdonald, Kevin Liu, Y. Reshitnyk, W. Sim, and R. W. Hill Measurements of thermal expansion and magnetostriction on a single-crystal sample of the Ising ferromagnetic material, LiHoF 4 , are presented. The strain is measured along the crystallographic c axis (the Ising direction) of the material and the magnetic field is applied transverse to this, in the a b ... [Phys. Rev. B 86, 094428] Published Mon Sep 24, 2012

Keywords: Magnetism

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Magnetic coupling of single Co adatoms to a Co underlayer through a Pd spacer of variable thickness (2012)

L. V. Dzemiantsova, M. Hortamani, C. Hanneken, A. Kubetzka, K. von Bergmann, and R. Wiesendanger

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): L. V. Dzemiantsova, M. Hortamani, C. Hanneken, A. Kubetzka, K. von Bergmann, and R. Wiesendanger We have performed a combined experimental and theoretical investigation of Co atoms on top of a Pd spacer on Co/Ir(111). Using spin-polarized scanning tunneling microscopy and spectroscopy we first studied the morphology and the spin-resolved electronic properties of mono- and double-layer Pd on Co/... [Phys. Rev. B 86, 094427] Published Fri Sep 21, 2012

Keywords: Magnetism

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Three-dimensional shape dependence of spin-wave modes in single FePt nanomagnets (2012)

R. Brandt, F. Ganss, R. Rückriem, T. Senn, C. Brombacher, P. Krone, M. Albrecht, and H. Schmidt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): R. Brandt, F. Ganss, R. Rückriem, T. Senn, C. Brombacher, P. Krone, M. Albrecht, and H. Schmidt We report the dependence of the intrinsic spin-wave spectra on the three-dimensional shape in single FePt nanomagnetic elements. In contrast to the well-known center and edge modes in flat, circular nanodisks, curved nanomagnets with identical nominal thickness and footprint exhibit a rich multimode... [Phys. Rev. B 86, 094426] Published Fri Sep 21, 2012

Keywords: Magnetism

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^{51}V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo_{2}V_{2}O_{8} (2012)

Yukiichi Ideta, Yu Kawasaki, Yutaka Kishimoto, Takashi Ohno, Yoshitaka Michihiro, Zhangzhen He, Yutaka Ueda, and Mitsuru Itoh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Yukiichi Ideta, Yu Kawasaki, Yutaka Kishimoto, Takashi Ohno, Yoshitaka Michihiro, Zhangzhen He, Yutaka Ueda, and Mitsuru Itoh We report on our 51 V-NMR study of static and dynamical magnetic properties in the quasi-one-dimensional antiferromagnet BaCo 2 V 2 O 8 . Although the NMR spectrum shows well-defined antiferromagnetic (AF) order in the Néel ground state, the AF characteristic from the NMR spectrum is incomplete between 3.5... [Phys. Rev. B 86, 094433] Published Wed Sep 26, 2012

Keywords: Magnetism

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EuTiO_{3} magnetic structure studied by neutron powder diffraction and resonant x-ray scattering (2012)

Valerio Scagnoli, Mattia Allieta, Helen Walker, Marco Scavini, Takuro Katsufuji, Leyre Sagarna, Oksana Zaharko, and Claudio Mazzoli

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Valerio Scagnoli, Mattia Allieta, Helen Walker, Marco Scavini, Takuro Katsufuji, Leyre Sagarna, Oksana Zaharko, and Claudio Mazzoli We combine neutron powder diffraction and x-ray single-crystal magnetic diffraction at the Eu L 2 edge to scrutinize the magnetic motif of the Eu ions in magnetoelectric EuTiO 3 . Our measurements are consistent with an antiferromagnetic G -type pattern with the Eu magnetic moments ordering along the a , ... [Phys. Rev. B 86, 094432] Published Wed Sep 26, 2012

Keywords: Magnetism

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Interplay between magnetic anisotropy and dipolar interaction in one-dimensional nanomagnets: Optimized magnetocaloric effect (2012)

D. Serantes, V. Vega, W. O. Rosa, V. M. Prida, B. Hernando, M. Pereiro, and D. Baldomir

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): D. Serantes, V. Vega, W. O. Rosa, V. M. Prida, B. Hernando, M. Pereiro, and D. Baldomir The magnetocaloric effect (MCE) in one-dimensional (1D) magnetic nanostructures is optimized for a specific value of the magnetic field H * when applied perpendicularly to the longitudinal direction of the system. Our results reveal that H * corresponds to the saturation field, slightly above the tran... [Phys. Rev. B 86, 104431] Published Wed Sep 26, 2012

Keywords: Magnetism

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Statistical moment equations for stochastic spin dynamics in phase space: A uniaxial paramagnet subjected to a dc bias field of arbitrary orientation (2012)

Yuri P. Kalmykov, Serguey V. Titov, and William T. Coffey

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-29

Description: Author(s): Yuri P. Kalmykov, Serguey V. Titov, and William T. Coffey Spin dynamics in a dissipative environment are treated via the evolution (master) equation for the quasiprobability density function of spin orientations in the phase space of the polar and azimuthal angles in the weak spin-bath coupling and high-temperature limits. The explicit solution is written ... [Phys. Rev. B 86, 104435] Published Fri Sep 28, 2012

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Dzyaloshinsky-Moriya interaction and field-induced magnetic order in an antiferromagnetic honeycomb lattice compound Bi_{3}Mn_{4}O_{12}(NO_{3}) studied by high-field electron spin resonance (2012)

Susumu Okubo, Tomonari Ueda, Hitoshi Ohta, Weimin Zhang, Takahiro Sakurai, Nozomi Onishi, Masaki Azuma, Yuichi Shimakawa, Hiroki Nakano, and Tôru Sakai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-06

Description: Author(s): Susumu Okubo, Tomonari Ueda, Hitoshi Ohta, Weimin Zhang, Takahiro Sakurai, Nozomi Onishi, Masaki Azuma, Yuichi Shimakawa, Hiroki Nakano, and Tôru Sakai High-field electron spin resonance (ESR) measurements of Bi 3 Mn 4 O 12 (NO 3 ), which has been suggested recently as a new honeycomb lattice antiferromagnet with spin frustration, have been performed in a field region up to 20 T. An ESR measurement at 265 K shows an isotropic broad resonance, and the obtai... [Phys. Rev. B 86, 140401] Published Fri Oct 05, 2012

Keywords: Magnetism

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Phase diagram of a frustrated Heisenberg antiferromagnet on the honeycomb lattice: The J_{1}-J_{2}-J_{3} model (2012)

P. H. Y. Li, R. F. Bishop, D. J. J. Farnell, and C. E. Campbell

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-10

Description: Author(s): P. H. Y. Li, R. F. Bishop, D. J. J. Farnell, and C. E. Campbell We use the coupled-cluster method in high orders of approximation to make a comprehensive study of the ground-state (GS) phase diagram of the spin-1/2 J 1 - J 2 - J 3 model on a two-dimensional honeycomb lattice with antiferromagnetic (AFM) interactions up to third-nearest neighbors. Results are presented ... [Phys. Rev. B 86, 144404] Published Tue Oct 09, 2012

Keywords: Magnetism

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Measuring central-spin interaction with a spin bath by pulsed ENDOR: Towards suppression of spin diffusion decoherence (2012)

S. J. Balian, M. B. A. Kunze, M. H. Mohammady, G. W. Morley, W. M. Witzel, C. W. M. Kay, and T. S. Monteiro

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): S. J. Balian, M. B. A. Kunze, M. H. Mohammady, G. W. Morley, W. M. Witzel, C. W. M. Kay, and T. S. Monteiro We present pulsed electron-nuclear double resonance (ENDOR) experiments which enable us to characterize the coupling between bismuth donor spin qubits in Si and the surrounding spin bath of 29 Si impurities which provides the dominant decoherence mechanism (nuclear spin diffusion) at low temperatures... [Phys. Rev. B 86, 104428] Published Fri Sep 21, 2012

Keywords: Magnetism

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Universal low-temperature magnetic properties of the classical and quantum dimerized ferromagnetic spin chain (2012)

D. V. Dmitriev and V. Ya. Krivnov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-11

Description: Author(s): D. V. Dmitriev and V. Ya. Krivnov Low-temperature magnetic properties of both classical and quantum dimerized ferromagnetic spin chains are studied. It is shown that at low temperatures the classical dimerized model reduces to the classical uniform model with the effective exchange integral J 0 = J (1− δ 2 ), where δ is the dimerization pa... [Phys. Rev. B 86, 134407] Published Wed Oct 10, 2012

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Probing ultrafast optomagnetism by terahertz Cherenkov radiation (2012)

M. I. Bakunov, R. V. Mikhaylovskiy, and S. B. Bodrov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-11

Description: Author(s): M. I. Bakunov, R. V. Mikhaylovskiy, and S. B. Bodrov We put forward Cherenkov-type terahertz emission from a moving pulse of magnetization as a method to explore ultrafast optomagnetic phenomena. We propose to use a structure comprising a slab of transparent magnetooptic material coupled to an output prism. An ultrashort laser pulse propagates in the ... [Phys. Rev. B 86, 134405] Published Wed Oct 10, 2012

Keywords: Magnetism

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Magnetic order and spin-flop transitions in the cobalt-doped multiferroic Mn_{1−x}Co_{x}WO_{4} (2012)

Feng Ye, Songxue Chi, Jaime A. Fernandez-Baca, Huibo Cao, K.-C. Liang, Yaqi Wang, Bernd Lorenz, and C. W. Chu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): Feng Ye, Songxue Chi, Jaime A. Fernandez-Baca, Huibo Cao, K.-C. Liang, Yaqi Wang, Bernd Lorenz, and C. W. Chu We present a comprehensive single-crystal neutron diffraction investigation of the Mn 1− x Co x WO 4 with 0.02≤ x ≤0.30. At lower concentration x ≤0.05, the system is quickly driven into the multiferroic phase with spin structure forming an elliptical spiral order similar to the parent compound. The reductio... [Phys. Rev. B 86, 094429] Published Mon Sep 24, 2012

Keywords: Magnetism

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Full magnetoelectric response of Cr_{2}O_{3} from first principles (2012)

Andrei Malashevich, Sinisa Coh, Ivo Souza, and David Vanderbilt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): Andrei Malashevich, Sinisa Coh, Ivo Souza, and David Vanderbilt The linear magnetoelectric response of Cr 2 O 3 at zero temperature is calculated from first principles by tracking the change in magnetization under a macroscopic electric field. Both the spin and the orbital contributions to the induced magnetization are computed, and in each case the response is dec... [Phys. Rev. B 86, 094430] Published Mon Sep 24, 2012

Keywords: Magnetism

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Antiferromagnetic ordering on the frustrated fcc lattice in the intermetallic compound GdPtBi (2012)

Sergii Khmelevskyi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): Sergii Khmelevskyi The type of antiferromagnetic magnetic order in the half-Heusler intermetallic compound GdPtBi, where the Gd atoms form a magnetically frustrated fcc lattice, has been investigated using exchange constants calculated from first principles within the framework of the Green's function based magnetic f... [Phys. Rev. B 86, 104429] Published Mon Sep 24, 2012

Keywords: Magnetism

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Hydrogen-induced modification of the electronic structure and magnetic states in Fe, Co, and Ni monohydrides (2012)

N. Ishimatsu, T. Shichijo, Y. Matsushima, H. Maruyama, Y. Matsuura, T. Tsumuraya, T. Shishidou, T. Oguchi, N. Kawamura, M. Mizumaki, T. Matsuoka, and K. Takemura

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): N. Ishimatsu, T. Shichijo, Y. Matsushima, H. Maruyama, Y. Matsuura, T. Tsumuraya, T. Shishidou, T. Oguchi, N. Kawamura, M. Mizumaki, T. Matsuoka, and K. Takemura Hydrogen-induced modification of electronic structures, magnetic states, and crystal structures of transition metal (TM=Fe, Co, and Ni) monohydrides was investigated using TM K -edge x-ray magnetic circular dichroism (XMCD), x-ray diffraction, and first-principles calculations. The TM hydrides underg... [Phys. Rev. B 86, 104430] Published Mon Sep 24, 2012

Keywords: Magnetism

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Trends in the magnetic properties of Fe, Co, and Ni clusters and monolayers on Ir(111), Pt(111), and Au(111) (2012)

S. Bornemann, O. Šipr, S. Mankovsky, S. Polesya, J. B. Staunton, W. Wurth, H. Ebert, and J. Minár

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-29

Description: Author(s): S. Bornemann, O. Šipr, S. Mankovsky, S. Polesya, J. B. Staunton, W. Wurth, H. Ebert, and J. Minár We present a detailed theoretical investigation on the magnetic properties of small single-layered Fe, Co, and Ni clusters deposited on Ir(111), Pt(111), and Au(111). For this, a fully relativistic ab initio scheme based on density functional theory has been used. We analyze the element, size, and g... [Phys. Rev. B 86, 104436] Published Fri Sep 28, 2012

Keywords: Magnetism

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Large magnonic band gaps and spectra evolution in three-dimensional magnonic crystals based on magnetoferritin nanoparticles (2012)

S. Mamica, M. Krawczyk, M. L. Sokolovskyy, and J. Romero-Vivas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-05

Description: Author(s): S. Mamica, M. Krawczyk, M. L. Sokolovskyy, and J. Romero-Vivas We study magnonic crystals based on magnetoferritin nanoparticles. These nanoparticles self-assemble to form crystals of highly ordered fcc structure with a lattice constant of ten-odd nanometers. Filling the interparticle space by a ferromagnetic material should stabilize the ferromagnetic order in... [Phys. Rev. B 86, 144402] Published Thu Oct 04, 2012

Keywords: Magnetism

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Unified theory of ultrafast femtosecond and conventional picosecond magnetic dynamics in the distorted three-center magnetic cluster Ni_{3}Na_{2} (2012)

Hongping Xiang, Georgios Lefkidis, and Wolfgang Hübner

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-05

Description: Author(s): Hongping Xiang, Georgios Lefkidis, and Wolfgang Hübner With the use of a full ab initio method, based on quantum chemical wave function methods with the inclusion of spin-orbit coupling and a static external magnetic field, we investigate the laser-induced ultrafast magnetic switching in the three-magnetic-center cluster Ni 3 Na 2 under various static dist... [Phys. Rev. B 86, 134402] Published Thu Oct 04, 2012

Keywords: Magnetism

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Large spontaneous magnetostriction in FeTiO_{3} and adjustable magnetic configuration in Fe(III)-doped FeTiO_{3} (2012)

M. Charilaou, D. Sheptyakov, J. F. Löffler, and A. U. Gehring

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-31

Description: Author(s): M. Charilaou, D. Sheptyakov, J. F. Löffler, and A. U. Gehring We present neutron diffraction data and magnetic susceptibility measurements of FeTiO 3 ilmenite and Fe(III)-doped ilmenites (with 10 and 20 mol. % Fe 2 O 3 ) at temperatures of 1.9 K 〈 T 〈 300 K. The magnetic moments of the Fe cations in FeTiO 3 lie predominantly along the c axis, with a weak compone... [Phys. Rev. B 86, 024439] Published Mon Jul 30, 2012

Keywords: Magnetism

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Tensor network states and ground-state fidelity for quantum spin ladders (2012)

Sheng-Hao Li, Qian-Qian Shi, Yao-Heng Su, Jin-Hua Liu, Yan-Wei Dai, and Huan-Qiang Zhou

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-02

Description: Author(s): Sheng-Hao Li, Qian-Qian Shi, Yao-Heng Su, Jin-Hua Liu, Yan-Wei Dai, and Huan-Qiang Zhou We have developed an efficient tensor network algorithm for spin ladders, which generates ground-state wave functions for infinite-size quantum spin ladders. The algorithm is able to efficiently compute the ground-state fidelity per lattice site, a universal phase transition marker, thus offering a ... [Phys. Rev. B 86, 064401] Published Wed Aug 01, 2012

Keywords: Magnetism

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Field-induced incommensurate spin structure of TbNiAl_{4} (2012)

W. D. Hutchison, D. J. Goossens, R. E. Whitfield, A. J. Studer, K. Nishimura, and T. Mizushima

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-14

Description: Author(s): W. D. Hutchison, D. J. Goossens, R. E. Whitfield, A. J. Studer, K. Nishimura, and T. Mizushima TbNiAl 4 exhibits incommensurate and commensurate magnetic ordering as a function of temperature. As a function of applied field it undergoes a series of magnetic phase transitions. The first of these transitions, into an intermediate spin arrangement, is the source of a large inverse magnetocaloric ... [Phys. Rev. B 86, 014412] Published Fri Jul 13, 2012

Keywords: Magnetism

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Phase diagram of the Dzyaloshinskii-Moriya helimagnet Ba_{2}CuGe_{2}O_{7} in canted magnetic fields (2012)

S. Mühlbauer, S. Gvasaliya, E. Ressouche, E. Pomjakushina, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-14

Description: Author(s): S. Mühlbauer, S. Gvasaliya, E. Ressouche, E. Pomjakushina, and A. Zheludev The evolution of different magnetic structures of noncentrosymmetric Ba 2 CuGe 2 O 7 is systematically studied as a function of the orientation of the magnetic field H . Neutron diffraction in combination with measurements of magnetization and specific heat show a virtually identical behavior of the phase... [Phys. Rev. B 86, 024417] Published Fri Jul 13, 2012

Keywords: Magnetism

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Strong-field magnetotransport in a two-constituent columnar composite medium where the constituents have comparable resistivity tensors (2012)

David J. Bergman and Yakov M. Strelniker

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-12

Description: Author(s): David J. Bergman and Yakov M. Strelniker A two-constituent composite medium where the constituents have comparable but different resistivity tensors is considered for the case where the microstructure is columnar and the two Hall resistivities are much greater than all the Ohmic resistivities. Exact relations for such microstructures, alon... [Phys. Rev. B 86, 024414] Published Wed Jul 11, 2012

Keywords: Magnetism

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Two types of adjacent dimer layers in the low-temperature phase of BaCuSi_{2}O_{6} (2012)

D. V. Sheptyakov, V. Yu. Pomjakushin, R. Stern, I. Heinmaa, H. Nakamura, and T. Kimura

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-31

Description: Author(s): D. V. Sheptyakov, V. Yu. Pomjakushin, R. Stern, I. Heinmaa, H. Nakamura, and T. Kimura The low-temperature crystal structure of BaCuSi 2 O 6 has been investigated with high-resolution synchrotron x-ray and neutron powder diffraction techniques and has been found to be on average (ignoring the incommensurate modulation) orthorhombic, with the most probable space group I b a m . The Cu-Cu dime... [Phys. Rev. B 86, 014433] Published Mon Jul 30, 2012

Keywords: Magnetism

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Effect of disorder on quantum phase transition in the double layered ruthenates (Sr_{1−x}Ca_{x})_{3}Ru_{2}O_{7} (2012)

Zhe Qu, Jin Peng, Tijiang Liu, David Fobes, Vlad Dobrosavljević, Leonard Spinu, and Z. Q. Mao

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-31

Description: Author(s): Zhe Qu, Jin Peng, Tijiang Liu, David Fobes, Vlad Dobrosavljević, Leonard Spinu, and Z. Q. Mao (Sr 1− x Ca x ) 3 Ru 2 O 7 is characterized by complex magnetic states, spanning from a long-range antiferromagnetically ordered state over an unusual heavy-mass nearly ferromagnetic (NFM) state to an itinerant metamagnetic (IMM) state. The NFM state, which occurs in the 0.4 〉 x 〉 0.08 composition range, ... [Phys. Rev. B 86, 014434] Published Mon Jul 30, 2012

Keywords: Magnetism

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Investigation of the spin exchange interactions and the magnetic structure of the high-temperature multiferroic CuBr_{2} (2012)

C. Lee, Jia Liu, M.-H. Whangbo, H.-J. Koo, R. K. Kremer, and A. Simon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-22

Description: Author(s): C. Lee, Jia Liu, M.-H. Whangbo, H.-J. Koo, R. K. Kremer, and A. Simon We report a detailed density functional analysis of the spin exchange interactions and the magnetic structure of the high-temperature multiferroic CuBr 2 and compare the results with magnetic susceptibility measurements. CuBr 2 shows one-dimensional antiferromagnetism and undergoes long-range antiferr... [Phys. Rev. B 86, 060407] Published Tue Aug 21, 2012

Keywords: Magnetism

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Demagnetization-borne microscale skyrmions (2012)

Patrick Johnson, A. K. Gangopadhyay, Ramki Kalyanaraman, and Zohar Nussinov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-21

Description: Author(s): Patrick Johnson, A. K. Gangopadhyay, Ramki Kalyanaraman, and Zohar Nussinov Magnetic systems are an exciting realm of study that is being explored on smaller and smaller scales. One extremely interesting magnetic state that has gained momentum in recent years is the skyrmionic state. It is characterized by a vortex where the edge magnetic moments point opposite to the core.... [Phys. Rev. B 86, 064427] Published Mon Aug 20, 2012

Keywords: Magnetism

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Magnetic ordering and multiferroicity in MnI_{2} (2012)

Xianxin Wu, Yingxiang Cai, Qing Xie, Hongming Weng, Heng Fan, and Jiangping Hu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-16

Description: Author(s): Xianxin Wu, Yingxiang Cai, Qing Xie, Hongming Weng, Heng Fan, and Jiangping Hu Density-functional calculations are carried out to investigate incommensurate magnetic structures and ferroelectric polarization in the newly discovered multiferroic material MnI 2 . The exchange interactions among local moments on Mn are parameterized by mapping the mean-field Heisenberg model on to ... [Phys. Rev. B 86, 134413] Published Mon Oct 15, 2012

Keywords: Magnetism

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Dissipationless dynamics of randomly coupled spins at high temperatures (2012)

Lara Faoro, Lev Ioffe, and Alexei Kitaev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-16

Description: Author(s): Lara Faoro, Lev Ioffe, and Alexei Kitaev We develop a technique to compute the high-frequency asymptotics of spin correlators in weakly interacting disordered spin systems. We show that the dynamical spin correlator decreases exponentially at high frequencies 〈 S S 〉 ω ∼exp(− τ * ω ) and compute the characteristic time τ * of this dependence. In a t... [Phys. Rev. B 86, 134414] Published Mon Oct 15, 2012

Keywords: Magnetism

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Deconvoluting reversal modes in exchange-biased nanodots (2012)

Randy K. Dumas, Chang-Peng Li, Igor V. Roshchin, Ivan K. Schuller, and Kai Liu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-16

Description: Author(s): Randy K. Dumas, Chang-Peng Li, Igor V. Roshchin, Ivan K. Schuller, and Kai Liu Ensemble-averaged exchange bias in arrays of Fe/FeF 2 nanodots has been deconvoluted into local, microscopic bias separately experienced by nanodots going through different reversal modes. The relative fraction of dots in each mode can be modified by exchange bias. Single-domain dots exhibit a simple... [Phys. Rev. B 86, 144410] Published Mon Oct 15, 2012

Keywords: Magnetism

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Correspondence between long-range and short-range spin glasses (2012)

R. A. Baños, L. A. Fernandez, V. Martin-Mayor, and A. P. Young

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-18

Description: Author(s): R. A. Baños, L. A. Fernandez, V. Martin-Mayor, and A. P. Young We compare the critical behavior of the short-range Ising spin glass with a spin glass with long-range interactions which fall off as a power σ of the distance. We show that there is a value of σ of the long-range model for which the critical behavior is very similar to that of the short-range model... [Phys. Rev. B 86, 134416] Published Wed Oct 17, 2012

Keywords: Magnetism

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Surface acoustic wave driven ferromagnetic resonance in nickel thin films: Theory and experiment (2012)

L. Dreher, M. Weiler, M. Pernpeintner, H. Huebl, R. Gross, M. S. Brandt, and S. T. B. Goennenwein

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-18

Description: Author(s): L. Dreher, M. Weiler, M. Pernpeintner, H. Huebl, R. Gross, M. S. Brandt, and S. T. B. Goennenwein We present an extensive experimental and theoretical study of surface acoustic wave driven ferromagnetic resonance. In a first modeling approach based on the Landau-Lifshitz-Gilbert equation, we derive expressions for the magnetization dynamics upon magnetoelastic driving that are used to calculate ... [Phys. Rev. B 86, 134415] Published Wed Oct 17, 2012

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Parametric excitation of magnetization oscillations controlled by pure spin current (2012)

E. R. J. Edwards, H. Ulrichs, V. E. Demidov, S. O. Demokritov, and S. Urazhdin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-23

Description: Author(s): E. R. J. Edwards, H. Ulrichs, V. E. Demidov, S. O. Demokritov, and S. Urazhdin We report an experimental investigation of parametric excitation of magnetization oscillations in a permalloy microdisk in the presence of a pure spin current. The latter is generated by an adjacent Pt layer due to the spin Hall effect. We demonstrate that the spin torque induced by the pure spin cu... [Phys. Rev. B 86, 134420] Published Mon Oct 22, 2012

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Ferromagnetic insulating state in tensile-strained LaCoO_{3} thin films from LDA + U calculations (2012)

Han Hsu, Peter Blaha, and Renata M. Wentzcovitch

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-12

Description: Author(s): Han Hsu, Peter Blaha, and Renata M. Wentzcovitch With local density approximation + Hubbard U (LDA+ U ) calculations, we show that the ferromagnetic (FM) insulating state observed in tensile-strained LaCoO 3 epitaxial thin films is most likely a mixture of low-spin (LS) and high-spin (HS) Co, namely, a HS/LS mixture state. Compared with other FM states... [Phys. Rev. B 85, 140404] Published Wed Apr 11, 2012

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Ferromagnetism induced in the anisotropic stacked kagome lattice antiferromagnet Cs_{2}Cu_{3}CeF_{12} (2012)

Taiki Amemiya, Izumi Umegaki, Hidekazu Tanaka, Toshio Ono, Akira Matsuo, and Koichi Kindo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): Taiki Amemiya, Izumi Umegaki, Hidekazu Tanaka, Toshio Ono, Akira Matsuo, and Koichi Kindo The magnetic properties of Cs 2 Cu 3 CeF 12 were investigated through magnetization and specific heat measurements. Cs 2 Cu 3 CeF 12 is composed of a buckled kagome lattice of Cu 2+ , which is stacked along the b axis. The exchange network in the buckled kagome lattice is strongly anisotropic. Consequently, Cs 2 ... [Phys. Rev. B 85, 144409] Published Thu Apr 12, 2012

Keywords: Magnetism

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Geometry dependence on inverse spin Hall effect induced by spin pumping in Ni_{81}Fe_{19}/Pt films (2012)

H. Nakayama, K. Ando, K. Harii, T. Yoshino, R. Takahashi, Y. Kajiwara, K. Uchida, Y. Fujikawa, and E. Saitoh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): H. Nakayama, K. Ando, K. Harii, T. Yoshino, R. Takahashi, Y. Kajiwara, K. Uchida, Y. Fujikawa, and E. Saitoh Geometric effects on the inverse spin Hall effect (ISHE) induced by the spin pumping driven by the ferromagnetic resonance (FMR) have been investigated quantitatively. We measured the FMR spectra and the electromotive force induced by the ISHE with changing the size and the thickness in Ni 81 Fe 19 /Pt ... [Phys. Rev. B 85, 144408] Published Thu Apr 12, 2012

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Magnetic order and spin dynamics in the proximity of a ferromagnetic quantum critical point: A μSR study of YbNi_{4}P_{2} (2012)

J. Spehling, M. Günther, C. Krellner, N. Yèche, H. Luetkens, C. Baines, C. Geibel, and H.-H. Klauss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): J. Spehling, M. Günther, C. Krellner, N. Yèche, H. Luetkens, C. Baines, C. Geibel, and H.-H. Klauss The local 4 f -electronic spin dynamics and magnetic order in YbNi 4 P 2 were studied by means of muon-spin relaxation measurements. Zero-field muon-spin relaxation proves static magnetic order with a strongly reduced ordered Yb 3+ moment of (2.5–4.6)×10 −2 μ B , below T C =140 mK. Above T C , the muon-spin polar... [Phys. Rev. B 85, 140406] Published Thu Apr 12, 2012

Keywords: Magnetism

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Anisotropic magnetoresistance in an antiferromagnetic local-moment metal (2012)

Huan Li

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-17

Description: Author(s): Huan Li To describe the layered arsenide antiferromagnetic local-moment metal Ba 1− x K x Mn 2 As 2 , we propose a model Hamiltonian with the local moment Heisenberg superexchanges and the Hund's coupling between itinerant electrons and the local moments. The electric resistivity due to electron-magnon scattering is... [Phys. Rev. B 85, 134426] Published Mon Apr 16, 2012

Keywords: Magnetism

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Structural modulations and magnetic properties of off-stoichiometric Ni-Mn-Ga magnetic shape memory alloys (2012)

A. Pramanick, X. P. Wang, K. An, A. D. Stoica, J. Yi, Z. Gai, C. Hoffmann, and X.-L. Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-17

Description: Author(s): A. Pramanick, X. P. Wang, K. An, A. D. Stoica, J. Yi, Z. Gai, C. Hoffmann, and X.-L. Wang A comparative description of the crystallographic structural details and the magnetic properties of Ni-Mn-Ga magnetic shape memory alloys are necessary to understand the physical origins of their magnetoelastic properties. The crystallographic structural details of an off-stoichiometric Ni 2 Mn 1.14 Ga 0... [Phys. Rev. B 85, 144412] Published Mon Apr 16, 2012

Keywords: Magnetism

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Magnetic exchange interactions and antiferromagnetism of ATcO_{3} (A= Ca, Sr, Ba) studied from first principles (2012)

V. S. Borisov, I. V. Maznichenko, D. Böttcher, S. Ostanin, A. Ernst, J. Henk, and I. Mertig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-05

Description: Author(s): V. S. Borisov, I. V. Maznichenko, D. Böttcher, S. Ostanin, A. Ernst, J. Henk, and I. Mertig The magnetic properties of A TcO 3 ( A = Ca, Sr, Ba) perovskites were studied from first principles using multiple-scattering theory. For each system, the most preferable magnetic order is antiferromagnetic where the magnetic moments of the nearest Tc atoms are aligned antiparallel to each other. In th... [Phys. Rev. B 85, 134410] Published Wed Apr 04, 2012

Keywords: Magnetism

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Effect of lattice geometry on magnon Hall effect in ferromagnetic insulators (2012)

T. Ideue, Y. Onose, H. Katsura, Y. Shiomi, S. Ishiwata, N. Nagaosa, and Y. Tokura

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-05

Description: Author(s): T. Ideue, Y. Onose, H. Katsura, Y. Shiomi, S. Ishiwata, N. Nagaosa, and Y. Tokura We have investigated the thermal Hall effect of magnons for various ferromagnetic insulators. For pyrochlore ferromagnetic insulators Lu 2 V 2 O 7 , Ho 2 V 2 O 7 , and In 2 Mn 2 O 7 , finite thermal Hall conductivities have been observed below the Curie temperature T C . From the temperature and magnetic-field dependen... [Phys. Rev. B 85, 134411] Published Wed Apr 04, 2012

Keywords: Magnetism

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Hydrogen-induced reversible spin-reorientation transition and magnetic stripe domain phase in bilayer Co on Ru(0001) (2012)

Benito Santos, Silvia Gallego, Arantzazu Mascaraque, Kevin F. McCarty, Adrian Quesada, Alpha T. N’Diaye, Andreas K. Schmid, and Juan de la Figuera

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-05

Description: Author(s): Benito Santos, Silvia Gallego, Arantzazu Mascaraque, Kevin F. McCarty, Adrian Quesada, Alpha T. N’Diaye, Andreas K. Schmid, and Juan de la Figuera Imaging the change in the magnetization vector in real time by spin-polarized low-energy electron microscopy, we observed a hydrogen-induced, reversible spin-reorientation transition in a cobalt bilayer on Ru(0001). Initially, hydrogen sorption reduces the size of out-of-plane magnetic domains and l... [Phys. Rev. B 85, 134409] Published Wed Apr 04, 2012

Keywords: Magnetism

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Heat transport of the quasi-one-dimensional Ising-like antiferromagnet BaCo_{2}V_{2}O_{8} in longitudinal and transverse fields (2012)

Z. Y. Zhao, X. G. Liu, Z. Z. He, X. M. Wang, C. Fan, W. P. Ke, Q. J. Li, L. M. Chen, X. Zhao, and X. F. Sun

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-06

Description: Author(s): Z. Y. Zhao, X. G. Liu, Z. Z. He, X. M. Wang, C. Fan, W. P. Ke, Q. J. Li, L. M. Chen, X. Zhao, and X. F. Sun The very-low-temperature thermal conductivity ( κ ) is studied for BaCo 2 V 2 O 8 , a quasi-one-dimensional Ising-like antiferromagnet exhibiting an unusual magnetic-field-induced order-to-disorder transition. The nearly isotropic transport in the longitudinal field indicates that the magnetic excitations s... [Phys. Rev. B 85, 134412] Published Thu Apr 05, 2012

Keywords: Magnetism

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Equation of state of paramagnetic CrN from ab initio molecular dynamics (2012)

Peter Steneteg, Björn Alling, and Igor A. Abrikosov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-06

Description: Author(s): Peter Steneteg, Björn Alling, and Igor A. Abrikosov The equation of state for chromium nitride has been debated in the literature in connection with a proposed collapse of its bulk modulus following the pressure-induced transition from the paramagnetic cubic phase to the antiferromagnetic orthorhombic phase [ F. Rivadulla et al. Nature Mater. 8 947 ... [Phys. Rev. B 85, 144404] Published Thu Apr 05, 2012

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Plaquette order and deconfined quantum critical point in the spin-1 bilinear-biquadratic Heisenberg model on the honeycomb lattice (2012)

H. H. Zhao, Cenke Xu, Q. N. Chen, Z. C. Wei, M. P. Qin, G. M. Zhang, and T. Xiang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-10

Description: Author(s): H. H. Zhao, Cenke Xu, Q. N. Chen, Z. C. Wei, M. P. Qin, G. M. Zhang, and T. Xiang We have precisely determined the ground state phase diagram of the quantum spin-1 bilinear-biquadratic Heisenberg model on the honeycomb lattice using the tensor renormalization group method. We find that the ferromagnetic, ferroquadrupolar, and a large part of the antiferromagnetic phases are stabl... [Phys. Rev. B 85, 134416] Published Mon Apr 09, 2012

Keywords: Magnetism

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Magnetic neutron scattering on nanocomposites: Decrypting cross-section images using micromagnetic simulations (2012)

Sergey Erokhin, Dmitry Berkov, Nataliya Gorn, and Andreas Michels

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-11

Description: Author(s): Sergey Erokhin, Dmitry Berkov, Nataliya Gorn, and Andreas Michels We have used numerical micromagnetics for the calculation of the magnetic (small-angle) neutron scattering cross section d Σ M / d Ω of nanocomposites. In contrast to neutron experiments, in which one generally measures only a weighted sum of the Fourier components of the magnetization, our approach allo... [Phys. Rev. B 85, 134418] Published Tue Apr 10, 2012

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First-principles calculation of helical spin order in iron perovskite SrFeO_{3} and BaFeO_{3} (2012)

Zhi Li, Robert Laskowski, Toshiaki Iitaka, and Takami Tohyama

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-11

Description: Author(s): Zhi Li, Robert Laskowski, Toshiaki Iitaka, and Takami Tohyama Motivated by the recent discovery of ferromagnetism in cubic perovskite BaFeO 3 under small magnetic field, we investigate spin order in BaFeO 3 and isostructural SrFeO 3 by first-principles calculation. On-site Coulomb and exchange interactions are necessary for the helical spin order consistent with ... [Phys. Rev. B 85, 134419] Published Tue Apr 10, 2012

Keywords: Magnetism

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Nonlinear motion of magnetic vortex cores during fast magnetic pulses (2012)

Keiki Fukumoto, Kuniaki Arai, Takashi Kimura, Yoshichika Otani, and Toyohiko Kinoshita

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-07

Description: Author(s): Keiki Fukumoto, Kuniaki Arai, Takashi Kimura, Yoshichika Otani, and Toyohiko Kinoshita The time evolution of vortex spin structures in ferromagnetic FeNi disks (4 μ m and 6 μ m in diameter and thickness of 30 nm) during fast magnetic field pulses was observed by time-resolved x-ray magnetic circular dichroism with photoelectron emission microscopy. For the smaller disk, the displacement... [Phys. Rev. B 85, 134414] Published Fri Apr 06, 2012

Keywords: Magnetism

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Transport properties of a multichannel Kondo dot in a magnetic field (2012)

Christoph B. M. Hörig and Dirk Schuricht

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-07

Description: Author(s): Christoph B. M. Hörig and Dirk Schuricht We study the nonequilibrium transport through a multichannel Kondo quantum dot in the presence of a magnetic field. We use the exact solution of the two-loop renormalization group equation to derive analytical results for the g factor, the spin relaxation rates, the magnetization, and the differenti... [Phys. Rev. B 85, 134413] Published Fri Apr 06, 2012

Keywords: Magnetism

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Magnetic interactions in the multiferroic phase of CuFe_{1−x}Ga_{x}O_{2} (x=0.035) refined by inelastic neutron scattering with uniaxial-pressure control of domain structure (2012)

Taro Nakajima, Setsuo Mitsuda, Jason T. Haraldsen, Randy S. Fishman, Tao Hong, Noriki Terada, and Yoshiya Uwatoko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-10

Description: Author(s): Taro Nakajima, Setsuo Mitsuda, Jason T. Haraldsen, Randy S. Fishman, Tao Hong, Noriki Terada, and Yoshiya Uwatoko We have performed inelastic neutron scattering measurements in the ferroelectric noncollinear-magnetic phase of CuFe 1− x Ga x O 2 (CFGO) with x =0.035 under applied uniaxial pressure. This system has three types of magnetic domains with three different orientations reflecting the trigonal symmetry of the ... [Phys. Rev. B 85, 144405] Published Mon Apr 09, 2012

Keywords: Magnetism

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Role of defect electronic states in the ferromagnetism in graphite (2012)

Zhoutong He, Xinmei Yang, Huihao Xia, T. Z. Regier, D. K. Chevrier, Xingtai Zhou, and T. K. Sham

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-10

Description: Author(s): Zhoutong He, Xinmei Yang, Huihao Xia, T. Z. Regier, D. K. Chevrier, Xingtai Zhou, and T. K. Sham The mechanism of ferromagnetism in carbon-based materials, which contain only s and p electrons in contrast to traditional ferromagnets based on 3 d or 4 f electrons, is important but unclear. Here, by means of near-edge x-ray-absorption fine-structure (NEXAFS) and bulk magnetization measurements, we ... [Phys. Rev. B 85, 144406] Published Mon Apr 09, 2012

Keywords: Magnetism

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Control of vortex pair states by post-deposition interlayer exchange coupling modification (2012)

Sebastian Wintz, Thomas Strache, Michael Körner, Christopher Bunce, Anja Banholzer, Ingolf Mönch, Roland Mattheis, Jörg Raabe, Christoph Quitmann, Jeffrey McCord, Artur Erbe, Kilian Lenz, and Jürgen Fassbender

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-10

Description: Author(s): Sebastian Wintz, Thomas Strache, Michael Körner, Christopher Bunce, Anja Banholzer, Ingolf Mönch, Roland Mattheis, Jörg Raabe, Christoph Quitmann, Jeffrey McCord, Artur Erbe, Kilian Lenz, and Jürgen Fassbender We report on both the global and micromagnetic properties of interlayer exchange coupled spin systems. Irradiation with Ne ions is employed to achieve a phase transition from antiferromagnetic to ferromagnetic coupling. For extended trilayer films a full quantitative analysis of the bilinear and biq... [Phys. Rev. B 85, 134417] Published Mon Apr 09, 2012

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Injection and detection of spin in a semiconductor by tunneling via interface states (2012)

R. Jansen, A. M. Deac, H. Saito, and S. Yuasa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-12

Description: Author(s): R. Jansen, A. M. Deac, H. Saito, and S. Yuasa Injection and detection of spin accumulation in a semiconductor having localized states at the interface is evaluated. Spin transport from a ferromagnetic contact by sequential, two-step tunneling via interface states is treated not in itself, but in parallel with direct tunneling. The spin accumula... [Phys. Rev. B 85, 134420] Published Wed Apr 11, 2012

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Phase diagram of the ferromagnetic shape memory alloys Ni_{2}MnGa_{1−x}Co_{x} (2012)

T. Kanomata, S. Nunoki, K. Endo, M. Kataoka, H. Nishihara, V. V. Khovaylo, R. Y. Umetsu, T. Shishido, M. Nagasako, R. Kainuma, and K. R. A. Ziebeck

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-12

Description: Author(s): T. Kanomata, S. Nunoki, K. Endo, M. Kataoka, H. Nishihara, V. V. Khovaylo, R. Y. Umetsu, T. Shishido, M. Nagasako, R. Kainuma, and K. R. A. Ziebeck Permeability, magnetization, and differential scanning calorimetry measurements are carried out on the ferromagnetic shape memory alloys Ni 2 MnGa 1− x Co x (0 ≤ x ≤ 0.20). On the basis of the experimental results, the phase diagram in the temperature-concentration plane is determined. The determined phas... [Phys. Rev. B 85, 134421] Published Wed Apr 11, 2012

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Competition between two- and three-sublattice ordering for S=1 spins on the square lattice (2012)

Tamás A. Tóth, Andreas M. Läuchli, Frédéric Mila, and Karlo Penc

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-10

Description: Author(s): Tamás A. Tóth, Andreas M. Läuchli, Frédéric Mila, and Karlo Penc We provide strong evidence that the S =1 bilinear-biquadratic Heisenberg model with nearest-neighbor interactions on the square lattice possesses an extended three-sublattice phase induced by quantum fluctuations for sufficiently large biquadratic interactions, in spite of the bipartite nature of the... [Phys. Rev. B 85, 140403] Published Mon Apr 09, 2012

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Mapping spin-polarized transitions with atomic resolution (2012)

P. Schattschneider, B. Schaffer, I. Ennen, and J. Verbeeck

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-12

Description: Author(s): P. Schattschneider, B. Schaffer, I. Ennen, and J. Verbeeck The coupling of angstrom-sized electron probes with spin-polarized electronic transitions shows that the inelastically scattered probe electron is in a mixed state containing electron vortices with nonzero orbital angular momentum. These electrons create an asymmetric intensity distribution in energ... [Phys. Rev. B 85, 134422] Published Wed Apr 11, 2012

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Partially disordered state and spin-lattice coupling in an S=3/2 triangular lattice antiferromagnet Ag_{2}CrO_{2} (2012)

M. Matsuda, C. de la Cruz, H. Yoshida, M. Isobe, and R. S. Fishman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-12

Description: Author(s): M. Matsuda, C. de la Cruz, H. Yoshida, M. Isobe, and R. S. Fishman Ag 2 CrO 2 is an S =3/2 frustrated triangular lattice antiferromagnet without an orbital degree of freedom. With decreasing temperature, a four-sublattice spin state develops. However, a long-range partially disordered state with five sublattices abruptly appears at T N =24 K, accompanied by a structural ... [Phys. Rev. B 85, 144407] Published Wed Apr 11, 2012

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Spin-wave analysis of the transverse-field Ising model on the checkerboard lattice (2012)

Louis-Paul Henry, Peter C. W. Holdsworth, Frédéric Mila, and Tommaso Roscilde

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-17

Description: Author(s): Louis-Paul Henry, Peter C. W. Holdsworth, Frédéric Mila, and Tommaso Roscilde The ground-state properties of the S =1/2 transverse-field Ising model on the checkerboard lattice are studied using linear spin-wave theory. We consider the general case of different couplings between nearest neighbors ( J 1 ) and next-to-nearest neighbors ( J 2 ). In zero field, the system displays a lar... [Phys. Rev. B 85, 134427] Published Mon Apr 16, 2012

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Theory of the magnetoeletric effect in a lightly doped high-T_{c} cuprate (2012)

S. Mukherjee, B. M. Andersen, Z. Viskadourakis, I. Radulov, and C. Panagopoulos

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): S. Mukherjee, B. M. Andersen, Z. Viskadourakis, I. Radulov, and C. Panagopoulos In a recent study, Viskadourakis et al. (arXiv:1111.0050) discovered that extremely underdoped La 2 CuO 4+ x is a relaxor ferroelectric and a magnetoelectric material at low temperatures. It is further observed that the magnetoelectric response is anisotropic for different directions of electric polariz... [Phys. Rev. B 85, 140405] Published Thu Apr 12, 2012

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Hydrogen-induced ferromagnetism in ZnO single crystals investigated by magnetotransport (2012)

M. Khalid and P. Esquinazi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-14

Description: Author(s): M. Khalid and P. Esquinazi We investigate the electrical and magnetic properties of low-energy H + -implanted ZnO single crystals with hydrogen concentrations up to ∼ 3 at% in the first 20-nm surface layer between 10 K and 300 K. All samples show clear ferromagnetic hysteresis loops at 300 K with a saturation magnetization up to... [Phys. Rev. B 85, 134424] Published Fri Apr 13, 2012

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Phase diagrams, distinct conformal anomalies, and thermodynamics of spin-1 bond-alternating Heisenberg antiferromagnetic chain in magnetic fields (2012)

Xin Yan, Wei Li, Yang Zhao, Shi-Ju Ran, and Gang Su

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-14

Description: Author(s): Xin Yan, Wei Li, Yang Zhao, Shi-Ju Ran, and Gang Su The ground state phase diagrams and thermodynamic properties of a spin-1 bond-alternating Heisenberg antiferromagnetic chain with a single-ion anisotropy in longitudinal and transverse magnetic fields are investigated jointly by means of the infinite time evolving block decimation, the linearized te... [Phys. Rev. B 85, 134425] Published Fri Apr 13, 2012

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