中文摘要：

本文基于宏观磁矩（macrospin）的Landau-Lifshitz-Gilbert方程,模拟研究了磁性自旋阀结构中由垂直膜面流向的自旋极化电流所激发的磁化转动动力学特性.直流自旋极化电流借助自旋转移矩效应可驱动磁矩翻转或作周期性振荡,交流电可以激发出具有混沌行为的磁矩振荡.展示了磁矩振荡行为随电流强度变化而发生倍周期分岔、直至混沌振荡的行为规律.

英文摘要：

The macrospin model based on Landau-Lifshitz-Gilbert equation is used to study the current-induced magnetization dynamics in magnetic spin valves. We find that the DC spin-polarized current could either switch the magnetization of free layer or excite the steady-state precessional motion via the so-called spin-transfer torque effect. The AC current could drive the chaotic oscillations. The route to chaotic oscillation depending on the strength of current is demonstrated through a series of period doubling bifurcations.