重金属层/铁磁层界面反演对称性破缺诱导的垂直磁矩零场翻转
Field-free Switching of Perpendicular Magnetization Induced by Inversion Symmetry Breaking at the Heavy-metal/Merromagnet Interface
王佳才 1郭晓庆 1吴敏 1薛海斌1
作者信息
- 1. 太原理工大学 物理学院,山西 太原 030024;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
- 折叠
摘要
本文基于宏自旋模型,研究了重金属层/铁磁层,即L11相CuPt/CoPt界面反演对称性破缺诱导的面外类场矩对铁磁层垂直磁矩零场翻转特性的影响.研究结果表明:对于存在反演对称性破缺的L11相CuPt/CoPt界面,当沿着其重金属层的高对称轴通入一个合适的短脉冲电流时,虽然界面反演对称性破缺诱导的面外类场矩,即3 m力矩在x-y平面内为零,但是,利用磁矩在x-y平面上下产生的非稳定振荡效应同样可以实现垂直磁矩的确定性零场翻转.此外,当该面外类场矩较大时,其可以增大短脉冲电流的长度选择范围,并进一步减小磁矩稳定翻转的阈值电流.上述结果为实现零场的自旋轨道矩磁随机存储器提供了一个可选择的理论方案.
Abstract
In this paper,the influence of the out-of-plane field-like torque induced by the interfacial inversion symmetry breaking in the heavy-metal/ferromagnet(the L11 phase CuPt/CoPt)bilayer on the characteristics of field-free perpendicular magnetization switching in the ferromagnetic layer is studied based on the macro-spin model.It is demonstrated that in the L11 phase CuPt/CoPt bi-layer with the inversion symmetry breaking,though the induced out-of-plane field-like torque,namely,the 3 m torque is quenched in the x-y plane,the field-free perpendicular magnetization switching can also be observed through the unsteady oscillating effect of the magnetization between above the x-y plane and below the one,when an appropriate short pulsed electric current is to be applied along the high symmetry axis of the heavy metal layer.Moreover,when the induced out-of-plane field-like torque is large enough,it can increase the selection range of short pulsed current length and further reduce the threshold current density of the steady magneti-zation switching.These results suggest an alternative theoretical scheme for the realization of field-free perpendicular magnetization switching of spin-orbit torque-magnetic random access memory.
关键词
宏自旋模型/自旋轨道矩/磁随机存储器Key words
macro-spin model/spin-orbit torque/magnetic random access memory引用本文复制引用
基金项目
山西省应用基础研究计划项目(20210302123184)
山西省应用基础研究计划项目(201601D011015)
山西省高等学校优秀青年学术带头人支持计划(163220120-S)
出版年
2024
国家科技期刊平台
NSTL
万方数据