| Autor: |
Kawamoto, Y., Kikkawa, T., Kawamata, M., Umemoto, Y., Manning, A. G., Rule, K. C., Ikeuchi, K., Kamazawa, K., Fujita, M., Saitoh, E., Kakurai, K., Nambu, Y. |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 3/25/2024, Vol. 124 Issue 13, p1-7, 7p |
| Abstrakt: |
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 T comp = 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 T comp 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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