Non Local Spin Detection in Ferromagnet/Superconductor/Ferromagnet Spin-Valve Device with Double-Tunnel Junctions
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概要
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The nonequilibrium spin accumulation in a nonmagnetic material caused by spin injection from ferromagnets can be detected as a voltage signal by the non local measurement technique. We applied this technique to a Ni81Fe19/Al/Ni81Fe19 spin-valve device with double-tunnel junctions to explore the effect of spin injection into the superconducting state of aluminum. The non local signal as a function of the external magnetic field and the injection current was found to behave very differently between the normal state at 10 K and the superconducting state at 0.5 K. The observed spin signal, up to 4 m$\Omega$ at 0.5 K, was 8 times larger than the signal at 10 K. We also found that the non local spin signal in the superconducting state drastically depended on the injection current, which was not the case for the normal state.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2006-04-15
著者
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Miura Katsuya
Graduate School Of Engineering Nagoya Institute Of Technology
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Ono Teruo
Institute For Chemical Research Kyoto University
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KASAI Shinya
Institute for Chemical Research, Kyoto University
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Kobayashi Kensuke
Institute For Chemical Research Kyoto University
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Miura Katsuya
Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
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Kasai Shinya
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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