Investigation on the Effect of Femtosecond Laser Induced Spin Transfer Torque of GdFeCo Alloy

Applied Sciences

Xinyu Zhang¹  Weiming Cheng²  Changsheng Xie³  Zhihao Zeng³  Haozhe Huang³  Haiwei Wang³  Rongyao Wang³ 

[1] School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China;School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China;Wuhan National Laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;

关键词: GdFeCo;    alloy;    atomistic spin simulation;    spin transfer torque;   

DOI  :  10.3390/app11146501

来源: DOAJ

【 摘 要 】

All-optical magnetic switching (AOS) provides a novel approach to improve writing ability and energy efficiency compared to those utilized in the mainstream magnetic data storage products. Rare earth-transition metals (RE-TM) exhibit extremely fast magnetization switching induced by one single incident linearly polarized laser pulse; however, the mechanism is still ambiguous. Here, we show by atomistic spin simulation that the laser induced spin transfer torque dominates the magnetization reversal of Fe sublattice in Gd₂₅Fe₇₅ alloy, and that the switching speed of Gd₂₅Fe₇₅ alloy is relevant to the amount of spin current. This implies that a possible helicity independent mechanism underlies the RE-TM alloy AOS process. We also find that the greater the spin current density the faster the magnetization switching, and the time magnetization reversal of Gd and Fe takes is also affected by the spin current density.

【 授权许可】

Unknown