[11a-E214-1~11] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[11a-E214-3] Time-Resolved Faraday Rotation Study of NiCo₂O₄ Thin Films

〇Kaede Yamada¹, Takahasshi Ryunosuke¹, Kan Daisuke², Shimakawa Yuichi², Wadati Hiroki^1,3 (1.Univ. of Hyogo, 2.ICR, Kyoto Univ., 3.ILE, Osaka Univ.)

Keywords:

NiCo_2O_4 Thin Films,Ultrafast Magnetization Dynamics,Time-Resolved Faraday Rotation

Ultrafast magnetization dynamics in inverse-spinel NiCo₂O₄ thin films were investigated by time-resolved Faraday rotation measurements using a 1030 nm pump pulse and a 515 nm probe pulse. Analysis of magnetic-field-reversed differential signals revealed that demagnetization continued for several picoseconds after the initial ultrafast demagnetization. Fitting with a model incorporating the experimental time resolution yielded two relaxation components, tau_fast ~ 0.3 ps and tau_slow = 5.7 ps. These results suggest that NiCo₂O₄ thin films exhibit Type-II ultrafast magnetization dynamics characterized by a two-step demagnetization process.