Using the time-resolved magneto-optical Kerr effect method, helicity-dependent all-optical magnetization switching (HD-AOS) is observed in ferrimagnetic TbFeCo films. Our results reveal the individual roles of the thermal and nonthermal effects after a single circularly polarized laser pulse. The evolution of this ultrafast switching occurs over different time scales, and a defined magnetization reversal time of 460 fs is shown—the fastest ever observed. Micromagnetic simulations based on a single macro-spin model, taking into account both heating and the inverse Faraday effect, are performed which reproduce HD-AOS demonstrating a linear path for magnetization reversal.
Roles of heating and helicity in ultrafast all-optical magnetization switching in TbFeCo
Xianyang Lu, Xiao Zou, Denise Hinzke, Tao Liu, Yichuan Wang, Tuyuan Cheng, Jing Wu, Thomas A. Ostler, Jianwang Cai, Ulrich Nowak, Roy W. Chantrell, Ya Zhai, Yongbing Xu; Roles of heating and helicity in ultrafast all-optical magnetization switching in TbFeCo. Appl. Phys. Lett. 16 July 2018; 113 (3): 032405. https://doi.org/10.1063/1.5036720
Download citation file: