Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12-Reference-Cited by-同舟云学术

Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12

Published:2024-03-25 Issue:13 Volume:124 Page:
ISSN:0003-6951
Container-title:Applied Physics Letters
language:en
Short-container-title:

Author:

Kawamoto Y.¹^ORCID,Kikkawa T.²³^ORCID,Kawamata M.¹,Umemoto Y.⁴^ORCID,Manning A. G.⁵^ORCID,Rule K. C.⁵^ORCID,Ikeuchi K.⁶,Kamazawa K.⁷,Fujita M.⁴,Saitoh E.²³⁸⁹^ORCID,Kakurai K.¹¹⁰^ORCID,Nambu Y.¹⁴^ORCID

Affiliation:

1. Department of Physics, Tohoku University 1 , Sendai 980-8578, Japan

2. Department of Applied Physics, University of Tokyo 2 , Tokyo 113-8656, Japan

3. WPI Advanced Institute for Materials Research, Tohoku University 3 , Sendai, 980-8577, Japan

4. Institute for Materials Research, Tohoku University 4 , Sendai 980-8577, Japan

5. Australian Nuclear Science and Technology Organisation 5 , Locked Bag 2001, Kirrawee DC, NSW 2232, Australia

6. Institute of Materials Structure Science, High Energy Accelerator Research Organization 6 , Tokai 319-1106, Japan

7. Comprehensive Research Organization for Science and Society 7 , Tokai 300-0811 Japan

8. Institute for AI and Beyond, The University of Tokyo 8 , Tokyo, 113-8656, Japan

9. Advanced Science Research Center, Japan Atomic Energy Agency 9 , Tokai 319-1195, Japan

10. RIKEN Center for Emergent Matter Science 10 , Saitama 351-0198, Japan

Abstract

Magnon spin currents in the ferrimagnetic garnet Tb3Fe5O12 with 4f electrons were examined through the spin-Seebeck effect and neutron scattering measurements. The compound shows a magnetic compensation, where the spin-Seebeck signal reverses above and below Tcomp=249.5(4) K. Unpolarized neutron scattering unveils two major magnon branches with finite energy gaps, which are well explained in the framework of spin-wave theory. Their temperature dependencies and the direction of the precession motion of magnetic moments, i.e., magnon polarization, defined using polarized neutrons, explain the reversal at Tcomp and decay of the spin-Seebeck signals at low temperatures. We illustrate an example that momentum- and energy-resolved microscopic information is a prerequisite to understand the magnon spin current.

Funder

Japan Society for the Promotion of Science

Japan Science and Technology Agency

Publisher

AIP Publishing

Link

https://pubs.aip.org/aip/apl/article-pdf/doi/10.1063/5.0197831/19855550/132406_1_5.0197831.pdf

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