[16p-D419-1~18] 10.2 Fundamental and exploratory device technologies for spin

▲ [16p-D419-10] Real space observation of microwave excited spin wave modes in a magnetic disk

〇Tomosato Hioki^1,2, Tomonao Araki², Kosuke Umemura², Koujiro Hoshi^2,3, Eiji Saitoh^2,1,3,4 (1.AIMR, Tohoku Univ., 2.Dept. Appl. Phys. Univ. Tokyo, 3.Inst. AI and Beyond, Univ. Tokyo, 4.JAEA)

Keywords:Magneto-optical imaging, Spin dynamics, Nonlinear interaction

In
plane standing spin wave modes in a minute magnetic disk are directly observed by using time resolved
magneto optical microscopy synchronized with microwaves. The time resolved microscopy allowed us to
obtain snapshots of standing spin wave modes i n a m agnetic disk, which show a n hourglass like standing
spin wave pattern. We found that the characteristic pattern is caused by spatially nonuniform magnetization
and a strong microwave excitation in terms of finite element calculation and micromagnetic simula tions.
The technique we developed in this work allows us to access magnetization dynamics in microstructured
magnets under strong microwave pumping.