[22p-A205-1~18] 10.2 Fundamental and exploratory device technologies for spin

▼ [22p-A205-15] Time resolved state tomography for time evolution of parametric oscillation of magnetization

〇Hiroki Shimizu¹, Tomosato Hioki^2,1, Eiji Saitoh^1,2 (1.Dept. Appl. Phys. Univ. Tokyo, 2.AIMR Tohoku Univ.)

Keywords: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.