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.

为了开发二维Van der Waals基于晶体的透明型自旋轨道扭矩设备，第一个关键步骤是找到一个有效的自旋极化源，可用于激活镁旋转电流。通过设计金属磁铁/拓扑半学异质结构，我们发现半分化的散装大厅效应很可观，从而导致高自旋轨道扭矩产生效率与重金属基于重金属的异质结构相当。令人惊讶的是，我们表明的证据表明，即使是在金属磁铁/半明确异质结中存在的能量屏障，该旋转运输表现为旋转运输，表现为大型观察到的类似野外的自旋轨道扭矩，因此旋转混合电导的大型虚构部分与常规智慧相反，提供了一种新的旋转传输机制。

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