中文摘要：

通过线性展开包含自旋转移矩项的Landau-Lifshitz-Gilbert（LLG）方程,并且使用稳定性分析的方法,建立了垂直磁各向异性自旋阀结构中的磁性相图。研究发现：通过调节外磁场强度的大小以及直流电流密度,可实现磁矩从稳定态到进动态之间的转化,以及在不同稳定态之间的翻转。

英文摘要：

By spreading the Landau-Lifshitz-Gilbert （LLG） equation including the spin transfer-torque term andusing the stability analysis method, the magnetic phase diagram is obtained. By adjusting the dc current density andthe magnitude of external magnetic field, the switching from stable states to precession states and the magnetizationreversal between different stable states can be realized.