摘要
研究了类场自旋转移力矩(STT)和极化层磁矩偏角对CoFeB-MgO-CoFeB磁隧道结中阈值电流密度以及翻转时间的影响。基于Landau-Lifshitz-Gilbert-Slonczewski(LLGS)方程,运用微磁模拟的方法研究了非共线磁性多层膜结构中的STT效应,着重考察了Slonczewski项和类场STT的影响情况。结果表明,在给极化层磁矩一个小的偏角时,阈值电流密度会大幅减小,减小幅度可达37%。而且类场STT和Slonczewski项对阈值电流密度和翻转时间有着重要影响。分析表明,类场STT和Slonczewski项在一定条件下可以明显地改善磁隧道结的翻转特性,此时类场STT有效地促进了自由层磁矩翻转的进程,从而使阈值电流密度减小,翻转时间进一步缩短。
The effects of the field-like spin transfer torque（STT）and polarization layer magnetization tilt angle on the threshold current density and the switching time in CoFeB-MgO-CoFeB magnetic tunnel junction were studied.Based on Landau-Lifshitz-Gilbert-Slonczewski（LLGS）equation,the spin transfer torque effect in the non-collinear magnetic multilayer structure was studied using the micro magnetic simulation,and the impacts of the Slonczewski and field-like STT were investigated emphatically.The results show that with a relatively small tilt angle of the polarization layer magnetization,the threshold current density decreases dramatically,as much as 37%.Furthermore,the Slonczewski and field-like STT have an important impact on the threshold current density and switching time.The analysis shows that the Slonczewski and fieldlike STT can obviously improve the switching properties of the magnetic tunnel junction under certain conditions,and the field-like STT effectively promotes the free layer magnetization switching process,thus reducing the threshold current density and switching time.
出处
《微纳电子技术》
北大核心
2016年第1期13-17,24,共6页
Micronanoelectronic Technology
基金
国家自然科学基金资助项目(61274089)
山西省国际合作项目(2014081029-2)
关键词
类场自旋转移力矩(STT)
磁隧道结
非共线极化层
微磁模拟
翻转特性
自由层磁矩
field-like spin transfer torque（STT）
magnetic tunnel junction
non-collinear polarization layer
micro magnetic simulation
switching property
free layer magnetization
