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KAKEN_18H03867seika.pdf
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Title |
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音波を用いたスピン流の高効率生成と伝導制御に関する研究
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Kana |
オンパ オ モチイタ スピンリュウ ノ コウコウリツ セイセイ ト デンドウ セイギョ ニ カンスル ケンキュウ
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Onpa o mochiita supinryū no kōkōritsu seisei to dendō seigyo ni kansuru kenkyū
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Study on efficient generation of spin current using macroscopic angular momentum
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能崎, 幸雄
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ノザキ, ユキオ
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Nozaki, Yukio
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慶應義塾大学・理工学部 (矢上) ・教授
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Research team head
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科研費研究者番号 : 30304760
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前川, 禎通
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マエカワ, サダミチ
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Maekawa, Sadamichi
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国立研究開発法人理化学研究所・創発物性科学研究センター・上級研究員
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Research team member
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科研費研究者番号 : 60005973
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2021
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科学研究費補助金研究成果報告書
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2020
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Abstract |
磁気を持たないありふれた金属である銅に音波を注入すると、結晶格子が毎秒10億回以上回転し、磁気の流れ(スピン流)が発生する。本研究では、音波に含まれる1兆分の1メートルオーダーの格子回転と交流スピン流を検出することに成功し、スピン流生成の微視的機構を決定することにより、スピン流生成効率が大きな材料を明らかにした。さらに、音波による直流スピン起電力生成と、電流渦による直流スピン流生成にも成功した。
Spin current, i.e. a flow of magnetization, can be generated in nonmagnetic Cu by applying an acoustic wave which consists of nonuniform rotation of atomic lattice with a frequency of gigahertz order. In this study, we have succeeded to measure not only a picometer order amplitude of lattice rotation but also an amplitude of acoustically generated alternating spin current which helps us to understand the microscopic mechanism of the spin current generation. From these experimental and theoretical studies, we have clarified which material is appropriate for the acoustic generation of spin current. Moreover, we have succeeded to generate both direct spin motive force and direct spin current from a lattice rotation in an acoustic wave and a vorticity of electric current, respectively.
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研究種目 : 基盤研究 (A) (一般)
研究期間 : 2018~2020
課題番号 : 18H03867
研究分野 : 磁性物理学、スピントロニクス
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