[17p-P10-1~93] 10 Spintronics and Magnetics（Poster）

[17p-P10-82] Correlation between Magnetic Properties and Depinning Field in Field-Driven Domain Wall Dynamics in GdFeCo Ferrimagnets

〇Tomoe Nishimura¹, Duck-Ho Kim¹, Yuusho Hirata¹, Takaya Okuno¹, Yasuhiro Hutakawa², Hiroki Yoshikawa², Arata Tsukamoto², Yoichi Shiota¹, Takahiro Moriyama¹, Teruo Ono^1,3 (1.ICR, Kyoto Univ., 2.Nihon Univ., 3.CSRN)

Keywords:Ferrimagnets, Field-Driven Domain Wall Dynamics

For this study, GdFeCo films with perpendicular magnetic anisotropy were prepared.The DW velocity v was measured as a function of an applied magnetic field μ₀H at different temperatures T by use of a real-time DW detection technique. We find that the depinning field μ₀H_dep monotonically decreases as T increases. Furthermore, we find that μ₀H_dep is proportional to (μ₀H_K/M_S)^1/2, where M_S is the saturation magnetization and μ₀H_K is the magnetic anisotropy field. This correlation between μ₀H_dep and the magnetic properties is understood in terms of the creep scaling law.