17:30 〜 17:45
▼ [22p-A205-15] Time resolved state tomography for time evolution of parametric oscillation of magnetization
キーワード：magnetization dynamics, parametric excitation
In this study, we extended the state tomography method for magnetization using AC spin current measurements to a time-resolved measurement system with high-speed signal processing techniques. We report the observation of the time-resolved magnetization dynamics in a magnetic parametron consisting of thin disk of yttrium iron garnet (YIG). We also report the observation of a magnon thermal squeezed state in which the thermal distribution of the magnetization is squeezed in one direction due to nonlinear effects of the parametric excitation.