[14p-PA1-1~74] 10 Spintronics and Magnetics

[14p-PA1-53] Direct Observation of Nucleation Process of Micron-Sized Magnetic Vortex by Means of Time-Resolved Photoemission Electron Microscopy

〇Takuo Ohkochi^1,2, Masaki Oura², Hitoshi Osawa¹, Akinobu Yamaguchi^3,2, Hidenori Fujiwara^4,2, Akira Sekiyama^4,2, Keisuke Yamada⁵, Toyohiko Kinoshita¹ (1.JASRI, 2.RIKEN/SPring-8, 3.Univ. Hyogo, 4.Osaka Univ., 5.Gifu Univ.)

Keywords:magnetization dynamics, magnetic vortex, photoemission electron microscopy

This research aims to observe nucleation process of a magnetic vortex in a micron-sized magnetic disc, by employing "transient demagnetization by laser pulses" and "time-resolved photoemission electron microscopy (PEEM) with soft-Xrays". Through this experiment, it is expected that "the time constants of emergence" of magnetostatic- and exchange-energy, which have already been known for a long time, can be quantitatively determined for the first time.