| Project/Area Number |
18H03867
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Medium-sized Section 28:Nano/micro science and related fields
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| Research Institution | Keio University |
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Principal Investigator |
Nozaki Yukio 慶應義塾大学, 理工学部(矢上), 教授 (30304760)
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| Co-Investigator(Kenkyū-buntansha) |
前川 禎通 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 (60005973)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥46,020,000 (Direct Cost: ¥35,400,000、Indirect Cost: ¥10,620,000)
Fiscal Year 2020: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2019: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2018: ¥34,060,000 (Direct Cost: ¥26,200,000、Indirect Cost: ¥7,860,000)
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| Keywords | スピン流 / 表面弾性波 / スピン起電力 / スピン渦度結合 / スピン波 / スピン回転結合 / スピン角運動量 |
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| Outline of Final Research Achievements |
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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| Academic Significance and Societal Importance of the Research Achievements |
磁気の流れであるスピン流は、電荷の流れに頼っていた電子デバイスの高性能化・高機能化に大きな革新をもたらすと期待されている。しかし、これまでスピン流の生成には磁気の強い物質や電子スピンと電流が強く結合する貴金属が不可欠であった。本研究成果は、より普遍的な物理法則である角運動量保存則を用いた全く新しいスピン流生成法を提供するものであり、CuやAlなど地球上に豊富に存在するクラーク数の大きい元素を用いたスピンデバイス実現に繋がる。
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