Stable magnetization states under a spin-polarized current and a magnetic field
Stable magnetization states under a spin-polarized current and a magnetic field
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DOI：
10.1103/physrevb.71.014439
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发表时间：
2005-01
影响因子：
3.7
通讯作者：
H. Morise;Shiho Nakamura
中科院分区：
文献类型：
--
作者：
H. Morise;Shiho Nakamura
从理论上研究了纳米级磁体在自旋极化电流作用下和外加磁场作用下的稳定磁化状态。我们考虑了三个方向的组合，即，磁铁的易磁化轴，电流的自旋极化和磁场的六种配置。对于每种结构，所有可能的稳定磁化状态，通过构建一个相图的基础上的Landau-Lifshitz-吉尔伯特方程的电流场平面。此外，对磁化的动态行为进行了分析。我们发现我们的系统没有表现出任何混乱行为。然而，初始条件对磁化运动有显著影响。
Stable magnetization states of a nanoscale magnet under torque by a spin-polarized current and one under torque by an external magnetic field are studied theoretically. We consider six configurations for the combination of the three directions, that is, the easy axis of the magnet, the spin polarization of the current, and the magnetic field. For each configuration, all the possible stable magnetization states are revealed by constructing a phase diagram in the current-field plane on the basis of the Landau-Lifshitz-Gilbert equation. In addition, analyses on the dynamic behaviors of the magnetization are presented. We find that our system does not exhibit any chaotic behaviors. Nevertheless, the initial condition has a significant effect on the magnetization motion.