| 研究課題/領域番号 |
22K14561
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分28020:ナノ構造物理関連
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| 研究機関 | 慶應義塾大学 |
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研究代表者 |
高 藤華 慶應義塾大学, 理工学研究科(矢上), 助教 (60896851)
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| 研究期間 (年度) |
2022-04-01 – 2023-03-31
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| 研究課題ステータス |
中途終了 (2022年度)
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| 配分額 *注記 |
4,550千円 (直接経費: 3,500千円、間接経費: 1,050千円)
2023年度: 1,820千円 (直接経費: 1,400千円、間接経費: 420千円)
2022年度: 2,730千円 (直接経費: 2,100千円、間接経費: 630千円)
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| キーワード | Spin-orbit torques / Energy barrier / Spin mixing conductance / Topological semimetal / Spin Hall effect / Magnonics / 2D materials |
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| 研究開始時の研究の概要 |
As a new class of materials, two-dimensional (2D) van der Waals (vdW) crystals with well established magnetic order are promising for efficient magnon spin transport; In this project, we aim to investigate the spin transport through vdW barriers as a magnon current medium, and clarify the relationship between magnon torque generation efficiency and exchange coupling in 2D vdw magnet.
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| 研究実績の概要 |
To develop two-dimensional van der Waals crystal based magnon spin-orbit torque devices, the first crucial step is to find an efficient spin polarization source that can be used to activate magnon spin current. By designing a metal-magnet/topological semimetal heterostructure, we find that the bulk spin Hall effect of the semimetal is sizable, leading to a high spin-orbit torque generation efficiency comparable to that in heavy metal based heterostructures. Strikingly, we show evidence that the energy barrier exists even in metal-magnet/semimetal heterojunctions, which governs spin transport manifested as a large observed field-like spin-orbit torque and thus a large imaginary part of the spin mixing conductance contrary to conventional wisdom, providing a new spin transport mechanism.
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