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 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 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.
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Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
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25 March 2024
Research Article|
March 27 2024
Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
Special Collection:
Magnonics
Y. Kawamoto
;
Y. Kawamoto
(Data curation, Formal analysis, Writing – original draft)
1
Department of Physics, Tohoku University
, Sendai 980-8578, Japan
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T. Kikkawa
;
T. Kikkawa
(Conceptualization, Data curation, Formal analysis, Writing – review & editing)
2
Department of Applied Physics, University of Tokyo
, Tokyo 113-8656, Japan
3
WPI Advanced Institute for Materials Research, Tohoku University
, Sendai, 980-8577, Japan
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M. Kawamata;
M. Kawamata
(Data curation)
1
Department of Physics, Tohoku University
, Sendai 980-8578, Japan
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Y. Umemoto
;
Y. Umemoto
(Visualization)
4
Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
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A. G. Manning
;
A. G. Manning
(Data curation, Methodology)
5
Australian Nuclear Science and Technology Organisation
, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
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K. C. Rule
;
K. C. Rule
(Data curation, Methodology)
5
Australian Nuclear Science and Technology Organisation
, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
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K. Ikeuchi;
K. Ikeuchi
(Data curation)
6
Institute of Materials Structure Science, High Energy Accelerator Research Organization
, Tokai 319-1106, Japan
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K. Kamazawa;
K. Kamazawa
(Data curation, Writing – review & editing)
7
Comprehensive Research Organization for Science and Society
, Tokai 300-0811 Japan
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M. Fujita;
M. Fujita
(Supervision)
4
Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
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E. Saitoh
;
E. Saitoh
(Conceptualization, Data curation, Supervision)
2
Department of Applied Physics, University of Tokyo
, Tokyo 113-8656, Japan
3
WPI Advanced Institute for Materials Research, Tohoku University
, Sendai, 980-8577, Japan
8
Institute for AI and Beyond, The University of Tokyo
, Tokyo, 113-8656, Japan
9
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
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K. Kakurai
;
K. Kakurai
(Data curation, Supervision, Writing – review & editing)
1
Department of Physics, Tohoku University
, Sendai 980-8578, Japan
10
RIKEN Center for Emergent Matter Science
, Saitama 351-0198, Japan
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Y. Nambu
Y. Nambu
a)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Physics, Tohoku University
, Sendai 980-8578, Japan
4
Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 124, 132406 (2024)
Article history
Received:
January 14 2024
Accepted:
March 08 2024
Citation
Y. Kawamoto, T. Kikkawa, M. Kawamata, Y. Umemoto, A. G. Manning, K. C. Rule, K. Ikeuchi, K. Kamazawa, M. Fujita, E. Saitoh, K. Kakurai, Y. Nambu; Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12. Appl. Phys. Lett. 25 March 2024; 124 (13): 132406. https://doi.org/10.1063/5.0197831
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