2022年第83回応用物理学会秋季学術講演会

講演情報

一般セッション(口頭講演)

10 スピントロニクス・マグネティクス » 10.2 スピン基盤技術・萌芽的デバイス技術

[22p-A205-1~18] 10.2 スピン基盤技術・萌芽的デバイス技術

2022年9月22日(木) 13:30 〜 18:30 A205 (A205)

金井 駿(東北大)、笠原 健司(福岡大)、伊藤 啓太(東北大)

18:00 〜 18:15

[22p-A205-17] Time resolved state tomography for persistent coherence in Y3Fe5O12

Tomosato Hioki1,2、Takahiko Makiuchi2、Hiroki Shimizu2、Koujiro Hoshi2,3、Mehrdad Elyasi1、Kei Yamamoto4、Naoto Yokoi2,3、Gerrit E.W. Bauer1、Eiji Saitoh2,1,3,4 (1.AIMR, Tohoku Univ.、2.Dept. Appl. Phys., UTokyo、3.Inst. AI and Beyond, UTokyo、4.JAEA)

キーワード:Magnetization dynamics, spintronics, magnon

Precessional motion of magnetization around the magnetic field decays to thermal equilibrium due to magnetization damping after cutting of the excitation force. After the decay, the phase coherence of the precession motion of magnetization was thought to be completely lost. Here we report the time-resolved magnetization dynamics measurement for a thin disk of yttrium iron garnet (YIG). We observed the prolonged coherence of the magnetization dynamics, which we call persistent coherence. Using newly developed time-resolved magnetization state tomography, we revealed that the temporal evolution of the persistent coherence exhibits two different time constant, which is supported by theoretical modelling. We will discuss the measurement method and detail of experimental results in the talk.