1
|
Nambu Y, Barker J, Okino Y, Kikkawa T, Shiomi Y, Enderle M, Weber T, Winn B, Graves-Brook M, Tranquada JM, Ziman T, Fujita M, Bauer GEW, Saitoh E, Kakurai K. Observation of Magnon Polarization. Phys Rev Lett 2020; 125:027201. [PMID: 32701305 DOI: 10.1103/physrevlett.125.027201] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
We measure the mode-resolved direction of the precessional motion of the magnetic order, i.e., magnon polarization, via the chiral term of inelastic polarized neutron scattering spectra. The magnon polarization is a unique and unambiguous signature of magnets and is important in spintronics, affecting thermodynamic properties such as the magnitude and sign of the spin Seebeck effect. However, it has never been directly measured in any material until this work. The observation of both signs of magnon polarization in Y_{3}Fe_{5}O_{12} also gives direct proof of its ferrimagnetic nature. The experiments agree very well with atomistic simulations of the scattering cross section.
Collapse
Affiliation(s)
- Y Nambu
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - J Barker
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Y Okino
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - T Kikkawa
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- WPI-AIMR, Tohoku University, Sendai 980-8577, Japan
| | - Y Shiomi
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - M Enderle
- Institut Laue-Langevin (ILL), 38042 Grenoble, France
| | - T Weber
- Institut Laue-Langevin (ILL), 38042 Grenoble, France
| | - B Winn
- Oak Ridge National Lab (ORNL), Oak Ridge, Tennessee 37831, USA
| | - M Graves-Brook
- Oak Ridge National Lab (ORNL), Oak Ridge, Tennessee 37831, USA
| | - J M Tranquada
- Brookhaven National Lab (BNL), Upton, New York 11973-5000, USA
| | - T Ziman
- Institut Laue-Langevin (ILL), 38042 Grenoble, France
- Université Grenoble Alpes, CNRS, LPMMC, 38000 Grenoble, France
| | - M Fujita
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - G E W Bauer
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- WPI-AIMR, Tohoku University, Sendai 980-8577, Japan
- Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, Netherlands
| | - E Saitoh
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- WPI-AIMR, Tohoku University, Sendai 980-8577, Japan
- Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - K Kakurai
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan
- Materials Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| |
Collapse
|
2
|
Niimi Y, Kimata M, Omori Y, Gu B, Ziman T, Maekawa S, Fert A, Otani Y. Strong Suppression of the Spin Hall Effect in the Spin Glass State. Phys Rev Lett 2015; 115:196602. [PMID: 26588404 DOI: 10.1103/physrevlett.115.196602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Indexed: 06/05/2023]
Abstract
We have measured spin Hall effects in spin glass metals, CuMnBi alloys, with the spin absorption method in the lateral spin valve structure. Far above the spin glass temperature T(g) where the magnetic moments of Mn impurities are randomly frozen, the spin Hall angle of a CuMnBi ternary alloy is as large as that of a CuBi binary alloy. Surprisingly, however, it starts to decrease at about 4T(g) and becomes as little as 7 times smaller at 0.5T(g). A similar tendency was also observed in anomalous Hall effects in the ternary alloys. We propose an explanation in terms of a simple model considering the relative dynamics between the localized moment and the conduction electron spin.
Collapse
Affiliation(s)
- Y Niimi
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - M Kimata
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - Y Omori
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - B Gu
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - T Ziman
- Institut Laue Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France
- LPMMC (UMR 5493), Université Grenoble Alpes and CNRS, 25 rue des Martyrs, B.P. 166, 38042 Grenoble, France
| | - S Maekawa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
- ERATO, Japan Science and Technology Agency, Sendai 980-8577, Japan
| | - A Fert
- Unité Mixte de Physique CNRS/Thales, 91767 Palaiseau France associée à l'Université de Paris-Sud, 91405 Orsay, France
| | - Y Otani
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
- RIKEN-CEMS, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| |
Collapse
|
3
|
Wei D, Niimi Y, Gu B, Ziman T, Maekawa S, Otani Y. The spin Hall effect as a probe of nonlinear spin fluctuations. Nat Commun 2012; 3:1058. [DOI: 10.1038/ncomms2063] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Accepted: 08/14/2012] [Indexed: 11/09/2022] Open
|
4
|
Gu B, Sugai I, Ziman T, Guo GY, Nagaosa N, Seki T, Takanashi K, Maekawa S. Surface-assisted spin Hall effect in Au films with Pt impurities. Phys Rev Lett 2010; 105:216401. [PMID: 21231326 DOI: 10.1103/physrevlett.105.216401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Indexed: 05/30/2023]
Abstract
We show, both experimentally and theoretically, a novel route to obtain giant room temperature spin-Hall effect due to surface-assisted skew scattering. In the experiment, we report the spin-Hall effect in Pt-doped Au films with different thicknesses t(N). The giant spin-Hall angle γ(S)=0.12±0.04 is obtained for t(N)=10 nm at room temperature, while it is much smaller for the t(N)=20 nm sample. Combined ab initio and quantum Monte Carlo calculations for the skew scattering due to a Pt impurity show γ(S)≅0.1 on the Au (111) surface, while it is small in bulk Au. The quantum Monte Carlo results show that the spin-orbit interaction of the Pt impurity on the Au (111) surface is enhanced, because the Pt 5d levels are lifted to the Fermi level due to the valence fluctuation. In addition, there are two spin-orbit interaction channels on the Au (111) surface, while only one in bulk Au.
Collapse
Affiliation(s)
- B Gu
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | | | | | | | | | | | | | | |
Collapse
|
5
|
Grenier B, Inagaki Y, Regnault LP, Wildes A, Asano T, Ajiro Y, Lhotel E, Paulsen C, Ziman T, Boucher JP. Ordering and excitations in the field-induced magnetic phase of Cs3Cr2Br9. Phys Rev Lett 2004; 92:177202. [PMID: 15169187 DOI: 10.1103/physrevlett.92.177202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2003] [Indexed: 05/24/2023]
Abstract
Field-induced magnetic order has been investigated in detail in the interacting spin 3/2 dimer system Cs3Cr2Br9. Elastic and inelastic neutron scattering measurements were performed up to H=6 T, well above the critical field H(c1) approximately 1.5 T. The ordering displays incommensurabilities and a large hysteresis before a commensurate structure is reached. This structure is fully determined. Surprisingly, the lowest excitation branch never closes. Above H(c1), the gap increases slowly with the field. An analysis in terms of projected pseudospins is given.
Collapse
Affiliation(s)
- B Grenier
- Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, Laboratoire Magnétisme et Diffraction Neutronique, CEA-Grenoble, 38054 Grenoble cedex 9, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Li ZD, Li L, Liu WM, Liang JQ, Ziman T. Exact soliton solution and inelastic two-soliton collision in a spin chain driven by a time-dependent magnetic field. Phys Rev E Stat Nonlin Soft Matter Phys 2003; 68:036102. [PMID: 14524827 DOI: 10.1103/physreve.68.036102] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2003] [Indexed: 11/07/2022]
Abstract
We investigate dynamics of exact N-soliton trains in a spin chain driven by a time-dependent magnetic field by means of an inverse scattering transformation. The one-soliton solution indicates obviously the spin precession around the magnetic field and periodic shape variation induced by the time-varying field as well. In terms of the general soliton solutions, N-soliton interaction and particularly various two-soliton collisions are analyzed. The inelastic collision by which we mean the soliton shape change before and after collision appears is generally due to the time-varying field. We, moreover, show that complete inelastic collisions can be achieved by adjusting spectrum and field parameters. This may lead to a potential technique of shape control of soliton.
Collapse
Affiliation(s)
- Zai-Dong Li
- Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China
| | | | | | | | | |
Collapse
|
7
|
Cépas O, Kakurai K, Regnault LP, Ziman T, Boucher JP, Aso N, Nishi M, Kageyama H, Ueda Y. Dzyaloshinski-Moriya interaction in the 2D spin gap system SrCu(2)(BO(3))(2). Phys Rev Lett 2001; 87:167205. [PMID: 11690240 DOI: 10.1103/physrevlett.87.167205] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2001] [Indexed: 05/23/2023]
Abstract
The Dzyaloshinski-Moriya interaction partially lifts the magnetic frustration of the spin-1/2 oxide SrCu(2)(BO(3))(2). It explains the fine structure of the excited triplet state and its unusual magnetic field dependence, as observed in previous ESR and new neutron inelastic scattering experiments. We claim that it is mainly responsible for the dispersion. We propose also a new mechanism for the observed ESR transitions forbidden by standard selection rules, which relies on an instantaneous Dzyaloshinski-Moriya interaction induced by spin-phonon couplings.
Collapse
Affiliation(s)
- O Cépas
- Institut Laue Langevin, BP 156, F-38042 Grenoble Cedex 9, France
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Grenier B, Cepas O, Regnault LP, Lorenzo JE, Ziman T, Boucher JP, Hiess A, Chatterji T, Jegoudez J, Revcolevschi A. Charge ordering and spin dynamics in NaV(2)O(5). Phys Rev Lett 2001; 86:5966-5969. [PMID: 11415405 DOI: 10.1103/physrevlett.86.5966] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2000] [Indexed: 05/23/2023]
Abstract
We report high-resolution neutron inelastic scattering experiments on the spin excitations of NaV(2)O(5). Below T(c), two branches with distinct energy gaps are identified. From the dispersion and intensity of the spin excitation modes, we deduce the precise zigzag charge distribution on the ladder rungs and the corresponding charge order: Delta(c) approximately 0.6. We argue that the spin gaps observed in the low-T phase of this compound are primarily due to the charge transfer.
Collapse
Affiliation(s)
- B Grenier
- Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, Laboratoire de Magnétisme et de Diffraction Neutronique, CEA-Grenoble, F-38054 Grenoble cedex 9, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
|
10
|
Affleck I, Gepner D, Schulz HJ, Ziman T. Critical behaviour of spin-s Heisenberg antiferromagnetic chains: analytic and numerical results. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0305-4470/22/5/015] [Citation(s) in RCA: 378] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
11
|
Gusmão M, Ziman T. Spin-density-wave instabilities for imperfectly nested Fermi surfaces: Application to BEDT-TTF salts. Phys Rev B Condens Matter 1996; 54:16663-16669. [PMID: 9985793 DOI: 10.1103/physrevb.54.16663] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
12
|
Campos CE, Sandhu PS, Brooks JS, Ziman T. Extended Hückel tight-binding study of the effect of pressure and uniaxial stress on the electronic structure of alpha -(BEDT-TTF)2KHg(SCN)4 and kappa -(BEDT-TTF)2Cu(NCS)2. Phys Rev B Condens Matter 1996; 53:12725-12732. [PMID: 9982943 DOI: 10.1103/physrevb.53.12725] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
13
|
|
14
|
Poilblanc D, Ziman T, Schulz HJ, Dagotto E. Dynamical properties of a single hole in an antiferromagnet. Phys Rev B Condens Matter 1993; 47:14267-14279. [PMID: 10005772 DOI: 10.1103/physrevb.47.14267] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
15
|
Poilblanc D, Schulz HJ, Ziman T. Single-hole spectral density in an antiferromagnetic background. Phys Rev B Condens Matter 1993; 47:3268-3272. [PMID: 10006412 DOI: 10.1103/physrevb.47.3268] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
16
|
Poilblanc D, Schulz HJ, Ziman T. Single hole in a quantum antiferromagnet: Finite-size-scaling approach. Phys Rev B Condens Matter 1992; 46:6435-6440. [PMID: 10002332 DOI: 10.1103/physrevb.46.6435] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
17
|
Zhang S, Schulz HJ, Ziman T. Ground-state energies of the nonlinear sigma model and the Heisenberg spin chains. Phys Rev Lett 1989; 63:1110-1113. [PMID: 10040467 DOI: 10.1103/physrevlett.63.1110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
18
|
|
19
|
Ziman T, Schulz HJ. Are antiferromagnetic spin chains representations of the higher Wess-Zumino-Witten models? Phys Rev Lett 1987; 59:140-143. [PMID: 10035123 DOI: 10.1103/physrevlett.59.140] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
20
|
Schulz HJ, Ziman T. Finite-length calculations of eta and phase diagrams of quantum spin chains. Phys Rev B Condens Matter 1986; 33:6545-6548. [PMID: 9939224 DOI: 10.1103/physrevb.33.6545] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
|
21
|
|