Switching speed distribution of spin-torque-induced magnetic reversal
Switching speed distribution of spin-torque-induced magnetic reversal
复制标题
自旋扭矩引起的磁反转的切换速度分布
DOI：
10.1063/1.2668365
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发表时间：
2006
影响因子：
3.2
通讯作者：
S. Zhang
中科院分区：
文献类型：
--
作者：
J. He;J. Sun;S. Zhang
利用Fokker-Planck方程（FPE）计算了单畴铁磁体在自旋电流激励下的开关几率。在单轴各向异性的情况下，FPE简化为一个常微分方程，其中最低特征值λ1决定最慢的开关事件。我们用解析和数值方法计算了λ1。研究发现，以前基于热分布初始磁化状态的模型[J. Z. Sun等人，Proc. SPIE 5359，445（2004）]可以在一些有用的限制条件下准确地证明。
The switching probability of a single-domain ferromagnet under spin-current excitation is evaluated using the Fokker-Planck equation (FPE). In the case of uniaxial anisotropy, the FPE reduces to an ordinary differential equation in which the lowest eigenvalue λ1 determines the slowest switching events. We have calculated λ1 using both analytical and numerical methods. It is found that the previous model based on thermally distributed initial magnetization states [J. Z. Sun et al., Proc. SPIE 5359, 445 (2004)] can be accurately justified in some useful limiting conditions.