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Spin-current-driven thermoelectric generation based on interfacial spin-orbit coupling

界面のスピン軌道相互作用によるスピン流起源の熱電生成

Yagmur, A.*; 軽部 修太郎*; 内田 健一*; 近藤 浩太*; 井口 亮*; 吉川 貴史*; 大谷 義近*; 齊藤 英治

Yagmur, A.*; Karube, Shutaro*; Uchida, Kenichi*; Kondo, Kota*; Iguchi, Ryo*; Kikkawa, Takashi*; Otani, Yoshichika*; Saito, Eiji

The longitudinal spin Seebeck effect (SSE) in Bi $$_{2}$$O$$_{3}$$/Cu/yttrium-iron-garnet (YIG) devices has been investigated. When an out-of-plane temperature gradient is applied to the Bi$$_{2}$$O$$_{3}$$/Cu/YIG device, a spin current is generated across the Cu/YIG interface via the SSE and then converted into electric voltage due to the spin$-orbit coupling at the Bi$_{2}$$O$$_{3}$$/Cu interface. The sign of the SSE voltage in the Bi$$_{2}$$O$$_{3}$$/Cu/YIG devices is opposite to that induced by the conventional inverse spin Hall effect in Pt/YIG devices. The SSE voltage in the Bi$$_{2}$$O$$_{3}$$/Cu/YIG devices disappears in the absence of the Bi$$_{2}$$O$$_{3}$$layer and its thermoelectric conversion efficiency is independent of the Cu thickness, indicating the important role of the Bi$$_{2}$$O$$_{3}$$/Cu interface. This result demonstrates that not only the bulk inverse spin Hall effect but also the spin-orbit coupling near the interface can be used for SSE-based thermoelectric generation.

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パーセンタイル:88.37

分野:Physics, Applied

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