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Improvement of Mixing Conductance and Spin-Seebeck Effect at Fe Interface Treatment

Published online by Cambridge University Press:  10 May 2016

Y. Iwasaki
Affiliation:
Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan
M. Ishida
Affiliation:
Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan Spin Quantum Rectification Project, ERATO, JST, Sendai 980-8577, Japan
A. Kirihara
Affiliation:
Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan Spin Quantum Rectification Project, ERATO, JST, Sendai 980-8577, Japan
K. Ihara
Affiliation:
Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan Spin Quantum Rectification Project, ERATO, JST, Sendai 980-8577, Japan
H. Someya
Affiliation:
Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan Spin Quantum Rectification Project, ERATO, JST, Sendai 980-8577, Japan
K. Uchida
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan PREST, JST, Saitama 332-0012, Japan
E. Saitoh
Affiliation:
Spin Quantum Rectification Project, ERATO, JST, Sendai 980-8577, Japan Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, 319-1195, Japan
T. Murakami
Affiliation:
Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan
S. Yorozu
Affiliation:
Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan Spin Quantum Rectification Project, ERATO, JST, Sendai 980-8577, Japan
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Abstract

In the previous work, it is reported that the Spin-Seebeck effect (SSE), which refer to the generation of a spin current from a temperature gradient, can be enhanced by Fe interface treatment. Here, we investigated the Fe thickness (d Fe ) dependency of spin-Seebeck voltage (V SSE ) and mixing conductance (g r ) in Pt/Fe/Bi:YIG/SGGG system. As a result, magnitude of V SSE had a peak at d Fe ≓ 1 ML (monolayer , ≓ 0.3 mm), and also increase of g r was saturated at this point. It suggests that V SSE increase with increasing g r when d Fe is smaller than 1.0 ML. For the case in which d Fe is larger than 1.0ML, however, V SSE decreases due to a spin current decay in Fe layer with a constant g r . These experimental results are consistent with previous theoretical works.

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Copyright
Copyright © Materials Research Society 2016 

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