Magnetic field dependence of the nonlocal spin Seebeck effect in Pt/YIG/Pt systems at low temperatures

We report the nonlocal spin Seebeck effect (nlSSE) in a lateral configuration of Pt/Y3Fe5O12(YIG)/Pt systems as a function of the magnetic field B (up to 10 T) at various temperatures T (3 K < T < 300 K). The nlSSE voltage decreases with increasing B in a linear regime with respect to the inpu...

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Bibliographic Details
Published inAIP advances Vol. 10; no. 1; pp. 015031 - 015031-5
Main Authors Oyanagi, Koichi, Kikkawa, Takashi, Saitoh, Eiji
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.01.2020
AIP Publishing LLC
Subjects
Dependence
Diffusion length
Low temperature
Magnetic fields
Magnons
Reduction
Seebeck effect
Thermal energy
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Summary:We report the nonlocal spin Seebeck effect (nlSSE) in a lateral configuration of Pt/Y3Fe5O12(YIG)/Pt systems as a function of the magnetic field B (up to 10 T) at various temperatures T (3 K < T < 300 K). The nlSSE voltage decreases with increasing B in a linear regime with respect to the input power (the applied charge-current squared I2). The reduction of the nlSSE becomes substantial when the Zeeman energy exceeds thermal energy at low temperatures, which can be interpreted as freeze-out of magnons relevant for the nlSSE. Furthermore, we found the nonlinear power dependence of the nlSSE with increasing I at low temperatures (T < 20 K), at which the B-induced signal reduction became less visible. Our experimental results suggest that in the nonlinear regime, high-energy magnons are overpopulated compared to those expected from the thermal energy. We also estimate the magnon spin diffusion length as functions of B and T.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5135944