2023年第70回応用物理学会春季学術講演会

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10 スピントロニクス・マグネティクス » 10.2 スピン基盤技術・萌芽的デバイス技術

[18a-D704-1~11] 10.2 スピン基盤技術・萌芽的デバイス技術

2023年3月18日(土) 09:00 〜 12:00 D704 (11号館)

後藤 穣(阪大)、磯上 慎二(物材機構)

10:30 〜 10:45

[18a-D704-6] [The 53rd Young Scientist Presentation Award Speech] The origin of the acoustic spin Hall effect

Takuya Kawada1、Hiroki Matsumoto1、Masashi Kawaguchi1、Hiroshi Kohno2、Masamitsu Hayashi1 (1.The Univ. of Tokyo、2.Nagoya Univ.)

キーワード:surface acoustic wave, spin current, spin orbit interaction

We demonstrated that SAW induces AC spin current in a heavy metal (HM) via spin-orbit interaction (acoustic spin Hall effect). The microscopic mechanism of the SAW-induced AC spin current, however, remained uncovered. In this work, we aim to identify the underlying mechanism of SAW-induced AC spin current. The acoustic voltages are measured for SAW devices with different SAW propagation orientation with respect to the electric polarization of a ferroelectric substrate. We also model the electromagnetic responses of a metallic thin film to an AC electric field coupled with SAW at the surface of the ferroelectric substrate. Obtained results indicate that the SAW-induced AC spin current is generated from the SAW-induced AC electric field via the spin Hall effect.