Micromagnetic investigation of the dynamics of magnetization switching induced by a spin polarized current
Micromagnetic investigation of the dynamics of magnetization switching induced by a spin polarized current
复制标题
自旋极化电流引起的磁化翻转动力学的微磁研究
DOI：
10.1063/1.2190450
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
B. Dieny
中科院分区：
文献类型：
--
作者：
Kyoung Jin Lee;B. Dieny
利用微磁模型，我们验证了单畴自旋转矩理论的预测，该理论认为开关电流密度对磁性电池尺寸的依赖性较弱。对于低自旋极化，开关时间和电流密度受电池尺寸的强烈影响。具有小长宽比和小自旋极化的较大样品可以表现出开关时间对电流的非单调依赖。由电流引起的圆形奥斯德场引起的非相干自旋波的激发是这种非单调依赖的原因。然而，当自旋极化高和/或电池尺寸小时，磁动力学恢复单畴行为。
Using micromagnetic modeling, we tested a prediction of single-domain spin-torque theory which switching current density depends only weakly on magnetic cell size. The switching time and current density are strongly affected by the cell size for low spin polarization. Larger samples with a small length-to-width ratio and small spin polarization can exhibit a nonmonotonous dependence of switching time on current. Excitation of incoherent spin waves caused by the circular Oersted field due to the current is responsible for this nonmonotonous dependence. However, the magnetic dynamics recovers a single-domain-like behavior when the spin polarization is high and/or the cell size is small.