论文标题
GHz范围应变脉冲诱导的磁化动力学的角度依赖性
The angular dependence of magnetization dynamics induced by a GHz range strain pulse
论文作者
论文摘要
磁化的动力学在旋转中很重要，在旋转中，声子和木魔之间的耦合引起了很多关注。在这项工作中，我们研究了纵向波声子和磁子之间耦合的角度依赖性。我们使用时间分辨的磁光kerr效应研究了磁化动力学，该动力学允许测量自旋波共振和磁回波信号。自旋波共振的频率，模式和幅度随外部磁场的平面角变化而变化。应变脉冲引起的磁回波信号的幅度也随角度变化。我们根据landau-lifshitz-gilbert方程来计算这些角度依赖，发现外部场和磁矩的角度是声子 - 马格诺耦合的重要因素，当声子在平面外磁场下沿厚度方向传播时。
The dynamics of magnetization is important in spintronics, where the coupling between phonon and magnon attracts much attention. In this work, we study the angular dependence of the coupling between longitudinal-wave phonon and magnon. We investigated the magnetization dynamics using the time-resolved magneto-optical Kerr effect, which allows measuring spin-wave resonances and the magnetic echo signal. The frequency, mode number, and amplitude of the spin-wave resonance change with the out-of-plane angle of the external magnetic field. The amplitude of the magnetic echo signal caused by the strain pulse also changes with the angle. We calculate these angular dependences based on the Landau-Lifshitz-Gilbert equation and find that the angles of the external field and magnetic moment are important factors for the phonon-magnon coupling when phonon propagates in the thickness direction under the out-of-plane magnetic field.
