论文标题
由超快光诱导的非磁性绝缘体触发的自旋波的激发和放松动力学
Excitation and relaxation dynamics of spin-waves triggered by ultrafast photo-induced demagnetization in a ferrimagnetic insulator
论文作者
论文摘要
通过时间分辨的磁光成像研究了平面磁场下的铁石榴石膜中自旋波的激发和传播动力学。实验结果和以下数据分析通过相位分辨自旋断层扫描仪揭示了沿样品深度方向触发的旋转波的激发。此外，观察到伴随自旋波发射引起的自旋转移的PID快速放松。讨论了石榴石电影中PID的可能方案。最后，我们开发了一个由PID触发的自旋波激发的模型，并解释了观察到的自旋波的振幅中的磁场依赖性。
Excitation and propagation dynamics of spin waves in an iron-based garnet film under out-of-plane magnetic field were investigated by time-resolved magneto-optical imaging. The experimental results and the following data analysis by phase-resolved spin-wave tomography reveal the excitation of spin waves triggered by photo-induced demagnetization (PID) along the sample depth direction. Moreover, the fast relaxation of PID accompanied by the spin transfer due to spin-wave emission was observed. Possible scenarios of PID in the garnet film are discussed. Finally, we develop a model for the spin-wave excitation triggered by PID and explain the magnetic-field dependence in the amplitude of the observed spin waves.
