[15p-PA01-1~58] 10 Spintronics and Magnetics (Poster)

[15p-PA01-16] Monotonic/cumulative nature of helicity-dependent optical magnetic switching in ferrimagnetic Gd–Fe–Co films

〇Takuo Ohkochi^1,9, Ryunosuke Takahashi², Hidenori Fujiwara^3,9, Hirokazu Takahashi⁴, Roman Adam⁵, Umut Parlak⁵, Kohei Yamamoto^6,10, Hitoshi Osawa¹, Masato Kotsugi^7,1, Arata Tsukamoto⁸, Hiroki Wadati^2,3,9, Akira Sekiyama^3,9, Claus M. Schneider⁵, Masakiyo Tsunoda⁴, Shigemasa Suga^3,5, Toyohiko Kinoshita¹ (1.JASRI, 2.Univ. Hyogo, 3.Osaka Univ., 4.Tohoku Univ., 5.Forschungszentrum Julich, 6.Inst. Molec. Sci., 7.Tokyo Univ. Sci., 8.Nihon Univ., 9.RIKEN, 10.Tokyo Univ.)

Keywords:Magnetic thin films, light-induced magnetization reversal, GdFeCo

It has been believed that the magnetization response to excitation by circularly polarized light is fundamentally different for ferrimagnetic and ferromagnetic materials. While single-shot homogeneous complete helicity-dependent magnetization switching (HDMS) has been observed in ferrimagnetic Gd–Fe–Co alloys, ferromagnetic [Co/Pt]_N multilayers require cumulative effects of multiple pulses to achieve HDMS. In this study, we show that both homogeneous and cumulative HDMS can be realized by systematically changing the angular momentum compensation and thermal diffusion in Gd–Fe–Co thin films.