We experimentally study the magnetization dynamics of an all-in-plane spin-torque oscillator (AIP-STO) by using injection locking to an external microwave magnetic field. The AIP-STO exhibits multiple frequency signals corresponding not only to the oscillation frequencies of the magnetic layers but also to the difference between these frequencies. The oscillation frequency is identified based on the principle that injection locking occurs only to the signal corresponding to the magnetization oscillation. We also analyze the magnetization dynamics during injection locking by micromagnetic simulations. The results demonstrate that injection locking is a powerful tool for elucidating the oscillation of the AIP-STO.

我们通过对外部微波磁场使用注入锁定来实验研究全平面自旋扭矩振荡器 (AIP-STO) 的磁化动力学。AIP-STO 表现出多个频率信号，不仅对应于磁性层的振荡频率，还对应于这些频率之间的差异。振荡频率的确定是基于注入锁定只发生在对应于磁化振荡的信号上的原理。我们还通过微磁模拟分析了注入锁定期间的磁化动力学。结果表明，注入锁定是阐明 AIP-STO 振荡的有力工具。