Deterministic magnetization switching by spin–orbit torque in a ferromagnet with tilted magnetic anisotropy: A macrospin modeling
Deterministic magnetization switching by spin–orbit torque in a ferromagnet with tilted magnetic anisotropy: A macrospin modeling
复制标题
具有倾斜磁各向异性的铁磁体中通过自旋轨道扭矩实现的确定性磁化强度切换：宏自旋建模
DOI：
10.1016/j.jmmm.2021.167757
复制
发表时间：
2021-06
影响因子：
2.7
通讯作者：
Liu Yaowen
中科院分区：
文献类型：
--
作者：
Wang Fengmao;Zhang Xiangli;Zhang Zongzhi;Liu Yaowen
在重金属/铁磁双层体系中，通过自旋-轨道相互作用实现面内电流注入的无场磁化转换是自旋-轨道力矩(SOT)应用的重要研究方向。在这里，我们从能谱的角度，从理论上论证了如何利用SOT效应来确定具有垂直倾斜磁各向异性(PMA)的CoFeB的磁化强度的切换。研究发现，磁化强度的转换既依赖于极化角θ，也依赖于倾斜磁化膜的方位角φ。在自旋电流脉冲脉冲期间偏离薄膜平面的微小剩余磁化分量是后续开关的关键点。其基本机制是PMA能垒随磁化角的移动，它控制着微小磁化分量的状态，从而导致双极确定性的开关。在仿真结果的基础上，建立了θ和φ确定性开关的相图。此外，正负临界开关电流密度随θ的变化呈现出类似星形的特征。这项研究为用倾斜PMA方法揭示SOT诱导的确定性开关的本质提供了一个基本的见解。
Field-free magnetization switching by in-plane current injection via spin–orbit interactions in heavy-metal/ferromagnet bilayer systems is of great interest for applications of spin–orbit torque (SOT). Here, we demonstrate theoretically how to deterministically switch the magnetization of CoFeB with a tilted perpendicular magnetic anisotropy (PMA) by using the SOT effect from the viewpoint of energy landscape. It is found that magnetization switching is dependent both on the polar angle θ and the azimuthal angle φ of the tilted PMA. A tiny remnant magnetization component that deviates away from the film plane during the spin current pulse impulsion period is a key point for the subsequent switching. The underlying mechanism is attributed to the shift of PMA energy barrier with the magnetization angle, which dominates the state of the tiny magnetization component and thereafter the bipolar deterministic switching. Based on the simulation results, a phase diagram of deterministic switching regarding θ and φ is established. Moreover, the positive and negative critical switching current densities are demonstrated to exhibit an astroid-like characteristic as a function of θ. This study provides a fundamental insight into the nature of SOT-induced deterministic switching with the tilted PMA method.
登录
查看更多内容
结合面内和面外偏振器的自旋阀中自旋扭矩驱动的磁化动力学建模
影响因子：
4
作者：
Hou, Zhiwei;Zhang, Zongzhi;Zhang, Jianwei;Liu, Yaowen
通讯作者：
Liu, Yaowen
通过在垂直磁隧道结中结合电场和自旋转移矩效应来实现磁化切换
影响因子：
4.6
作者：
Zhang X;Wang C;Liu Y;Zhang Z;Jin QY;Duan CG
通讯作者：
Duan CG
影响因子：
6.2
作者：
Zhengyang Zhao;A. Smith;M. Jamali;Jianping Wang
通讯作者：
Zhengyang Zhao;A. Smith;M. Jamali;Jianping Wang
影响因子：
3.7
作者：
Pai, Chi-Feng;Mann, Maxwell;Beach, Geoffrey S. D.
通讯作者：
Beach, Geoffrey S. D.
垂直磁化 Pt/Co/FeNi/Ta 结构中自旋轨道力矩的无场磁化翻转
影响因子：
4
作者：
Chang, Meixia;Yun, Jijun;Xi, Li
通讯作者：
Xi, Li