期刊
PHYSICAL REVIEW B
卷 92, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.064413
关键词
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资金
- JST, Japan
- MEXT, Japan [26103005, 25707029, 26790038, 26600067, 24244051, 15H02012]
- NEC Corporation
- Tanikawa Fund Promotion of Thermal Technology
- Casio Science Promotion Foundation
- Iwatani Naoji Foundation
- JSPS [15J08026]
- Grants-in-Aid for Scientific Research [26600067, 26790038, 15J08026, 26103005, 15H02012] Funding Source: KAKEN
The longitudinal spin Seebeck effect (LSSE) in Pt/Y3Fe5O12 (YIG) junction systems has been investigated at various magnetic fields and temperatures. We found that the LSSE voltage in a Pt/YIG-slab system is suppressed by applying high magnetic fields and this suppression is critically enhanced at low temperatures. The field-induced suppression of the LSSE in the Pt/YIG-slab system is too large at around room temperature to be explained simply by considering the effect of the Zeeman gap in magnon excitation. This result requires us to introduce a magnon-frequency-dependent mechanism into the scenario of LSSE; low-frequency magnons dominantly contribute to the LSSE. The magnetic field dependence of the LSSE voltage was observed to change by changing the thickness of YIG, suggesting that the thermospin conversion by the low-frequency magnons is suppressed in thin YIG films due to the long characteristic lengths of such magnons.
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