外延铁磁层磁矩方向依赖的垂直磁矩零场翻转特性  

Effect of the Magnetization Direction of Epitaxial Ferromagnetic Layer on the Field-free Switching of Perpendicular Magnetization

作　　者：吴敏[1,2] 王佳才 郭晓庆 薛海斌 WU Min;WANG Jiaca;GUO Xiaoqing;XUE Haibin(College of Physics,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学物理学院,山西太原030024 [2]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030024

出　　处：《山西大学学报（自然科学版）》2024年第6期1228-1237,共10页Journal of Shanxi University(Natural Science Edition)

基　　金：山西省应用基础研究计划项目(20210302123184,201601D011015);山西省高等学校优秀青年学术带头人支持计划(163220120-S)。

摘　　要：本文基于宏自旋模型,利用Landau-Lifshitz-Gilbert-Slonczewski方程在理论上研究了外延铁磁层的面内磁化方向m与电流方向J夹角φ_(m)对自由层垂直磁矩翻转的影响。研究结果表明:在铁磁层/重金属层/外延铁磁层的异质结中,对于自旋反常霍尔效应和自旋各向异性磁阻效应产生的沿m方向极化的自旋流与已经存在的沿z×J(z是薄膜的法线方向)和m×(z×J)方向的自旋流协同作用的情形,通过调节m与J的夹角φ_(m),可以进一步降低自由层磁矩零场翻转所需的阈值电流,并缩短施加脉冲电流的长度。上述结果为实现低功耗的零场自旋轨道矩磁随机存储器提供了一种可选择的理论方案。In this paper,the influence of the angle φ_(m) between the in-plane magnetized direction m of the epitaxial ferromagnetic layer and the direction of current flow J on the field-free perpendicular magnetization switching is theoretically studied based on the macro-spin model by using the Landau-Lifshitz-Gilbert-Slonczewski equation.It is demonstrated that in the ferromagnet/heavy-metal/epitaxial-ferromagnet trilayer system,in the presence of the spin current polarized along m generated by the spin anomalous Hall effect and spin anisotropic magnetor esistance effect in cooperation with the existing spin currents polarized alongz×J(zis the nor‐mal direction of the film)and m×(z×J),the threshold current of the field-free perpendicular magnetization switching can be fur‐ther reduced by adjusting the angle φ_(m) between m and J,and the length of the applied pulse current can be shortened.These results provide an alternative theoretical scheme for realizing the field-free spin-orbit torque magnetic random access memory with low power consumption.

关 键 词：自旋轨道矩磁随机存储器 自旋极化流 垂直磁矩零场翻转 

分 类 号：O469[理学—凝聚态物理]