基于外尔半金属WTe_(2)的自旋-轨道矩驱动磁矩翻转  

Magnetization switching driven by spin-orbit torque of Weyl semimetal WTe_2

作　　者：魏陆军 李阳辉 普勇 Wei Lu-Jun;Li Yang-Hui;Pu Yong(School of Science&New Energy Technology Engineering Laboratory of Jiangsu Provence,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学理学院,江苏省新能源技术工程实验室,南京210023

出　　处：《物理学报》2024年第1期82-89,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:52001169,61874060,U1932159,61911530220);南京邮电大学引进人才科研启动基金(批准号:NY219164,NY217118)资助的课题。

摘　　要：外尔半金属WTe_(2)有强自旋轨道耦合且能产生新奇非常规面外极化的自旋流,是近几年的新兴热点.同时WTe_(2)还具有高的电荷-自旋转换效率,能在无外磁场辅助的情况下实现垂直磁矩确定性的翻转,这对于高密度集成低功耗磁随机存取存储器至关重要.本文回顾了近几年WTe_(2)与铁磁层组成异质结构中自旋轨道矩研究的最新进展,包括用不同方法制备的WTe_(2)(例如机械剥离和化学气相沉积)与铁磁层(例如FeNi和CoFeB等)、二维磁体(例如Fe_(3)GeTe_(2)等)组成异质结的自旋轨道矩探测和磁矩翻转的电调控研究进展.最后,对相关研究的发展提出展望.The Wely semimetal WTe_(2) exhibits significant spin-orbit coupling characteristics and can generate unconventional spin current with out-of-plane polarization,which has become a hotspot in recent years.Meanwhile,WTe_(2) also has high charge-spin conversion efficiency,allowing perpendicular magnetization to be switched deterministically without the assistance of an external magnetic field,which is critical for the highdensity integration of low-power magnetic random-access memories.The purpose of this paper is to review the recent advances in the research on spin orbit torque in heterostructures composed of WTe_(2) and ferromagnetic layers,focusing on progress of research on the detection and magnetization switching in the spin orbit torque of heterojunctions composed of WTe_(2) prepared by different methods(e.g.mechanical exfoliation and chemical vapor deposition) and ferromagnetic layers such as conventional magnets(e.g,FeNi and CoFeB,etc.) and twodimensional magnets(e.g.Fe_3GeTe_2,etc.).Finally,the prospect of related research is discussed.

关 键 词：WTe_(2) 自旋轨道矩 磁矩翻转的电调控 

分 类 号：O469[理学—凝聚态物理]