外磁场和电流共同驱动的磁纳米柱中磁矩动力学
- 分享到:
摘要：
针对自由层与自旋极化层均为垂直磁各向异性材料的磁纳米柱结构,基于Landau-Lifshitz-Gilbert-Slonczewski(LLGS)方程,利用微磁学模拟方法,研究了外磁场和电流导致的自旋转矩效应所驱动的自由层磁矩翻转特性.模拟结果显示磁矩翻转曲线中出现了多个“凸起”的非正常翻转状态;且凸起区域出现的位置与外加磁场大小、纳米柱尺寸和垂直磁各向异性相关,而与极化层磁矩的倾角大小无关.在自旋极化层的磁矩倾角给定时,凸起区域出现的磁矩状态有亚稳态、振荡态、稳定态3种.给出建立了它们随磁场和极化层倾角变化的参数相图.
Materials with perpendicular magnetic anisotropy have been intensively investigated due to their potential applications in the nonvolatile magnetic memory and spin-torque oscillators.For the magnetic nano-pillars,free layer and the spin-polarizer are consist of perpendicular anisotropic materials,micromagnetic simulations which based on LLGS equation,used to research the magnetization switching with the external magnetic fields and spin-transfer torque.The simulations indicate that some abnormally switching states(peak areas)can take place in the switching final state curves due to the magnitude of the external magnetic field,the size of the nano-pillar,or the perpendicular magnetic anisotropy of the free layer,but has no relation to the angle of the titled spin-polarizer.For the peak areas,we noticed that three dynamics models of the magnetization appear with the fixed angle of the spin-polarizer:metastable state,oscillating state,and stable state.We have established parametric phase diagram that changed with the magnetic field and the angle of the titled spin-polarizer.
作者：
侯志伟 朱威峰 李霞 张红
Hou Zhiwei;Zhu Weifeng;Li Xia;Zhang Hong(Department of Physics,Henan University of Technology,Zhengzhou 450001,China;Department of Physics,Information Engineering University,Zhengzhou 450001,China;Information Science and Engineering School,Shandong Agricultural University,Tai'an 271018,China)
机构地区：
河南工业大学理学院 信息工程大学理学院 山东农业大学信息科学与工程学院
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2020年第3期47-51,共5页
基金：
国家自然科学基金青年科学基金(51201059,51302157) 河南省教育厅自然科学项目(14A140027) 河南工业大学校基金(2014CXRC10) 山东农业大学一流学科基金 重点培育学科项目资助课题.
关键词：
微磁学模拟 自旋转矩 磁各向异性
micromagnetic simulation spin-transfer-torque magnetic anisotropy
分类号：
O441.1 [理学—电磁学] O441.2 [理学—电磁学]
