Magnon spin-orbit torques in two-dimensional van der Waals magnets based heterostructures

基于异质结构的二维范德华磁体中的磁振子自旋轨道扭矩

• 批准号: 22K14561
• 负责人: 高 藤華
• 金额: $ 2.91万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22K14561/
• 关键词: Spin-orbit torques; Energy barrier; Spin mixing conductance; Topological semimetal; Spin Hall effect; Magnonics; 2D materials

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.

研制二维货车德瓦耳斯晶体磁振子自旋轨道力矩器件的关键是寻找一种有效的自旋极化源来激发磁振子自旋电流。通过设计一个金属-磁体/拓扑半金属异质结构，我们发现，体自旋霍尔效应的半金属是相当大的，导致高自旋轨道扭矩产生效率相比，在重金属基异质结构。引人注目的是，我们发现的证据表明，即使在金属-磁体/半金属异质结，这支配自旋运输表现为一个大的观察到的场一样的自旋轨道扭矩，从而大的虚部的自旋混合电导与传统的智慧，提供了一个新的自旋运输机制的能量障碍。

项目成果

Synthesis of transfer-free graphene films on dielectric substrates with controllable thickness via an in-situ co-deposition method for electrochromic devices

通过原位共沉积方法在介电基板上合成厚度可控的无转移石墨烯薄膜用于电致变色器件

• DOI: 10.1016/j.ceramint.2022.04.156
• 发表时间: 2022
• 期刊: Ceramics International
• 影响因子: 5.2
• 作者: Zhang Chitengfei;Cai Yilun;Guo Le;Tu Rong;Zheng Yingqiu;Li Bao-Wen;Zhang Song;Gao Tenghua
• 通讯作者: Gao Tenghua

Observation of long-range orbital transport and giant orbital torque

• DOI: 10.1038/s42005-023-01139-7
• 发表时间: 2023-02-06
• 期刊: COMMUNICATIONS PHYSICS
• 影响因子: 5.5
• 作者: Hayashi, Hiroki;Jo, Daegeun;Ando, Kazuya
• 通讯作者: Ando, Kazuya