Stability analysis of magnetization in a perpendicular magnetic layer driven by spin Hall effect
Zai-Dong Li(李再东)1,2,†, Xin-Xin Zhao(赵欣欣)1, and Tian-Fu Xu(徐天赋)3
1 Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics, School of Science, Tianjin University of Technology, Tianjin 300384, China; 2 Department of Applied Physics and School of Information Engineering, Hebei University of Technology, Tianjin 300401, China; 3 College of Science, Yanshan University, Qinhuangdao 066004, China
Abstract We investigate the stability of magnetization in free layer where the spin torque is induced by the spin Hall effect. In terms of the Landau-Liftshitz-Gilbert equation, we find the low-energy and high-energy equilibrium states, as well as the saddle points. The stability region is defined in the phase diagram spanned by the current density and the spin Hall angle. The spin Hall effect makes the previous saddle point into a stable state above a critical current. However, in the presence of magnetic field, the spin Hall effect leads to the opposite changes in the stable regions of the two low-energy states.
Fund: Project supported by the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices of Shanxi University of China (Grant No. KF202203).
Corresponding Authors:
Zai-Dong Li
E-mail: lizd@email.tjut.edu.cn
Cite this article:
Zai-Dong Li(李再东), Xin-Xin Zhao(赵欣欣), and Tian-Fu Xu(徐天赋) Stability analysis of magnetization in a perpendicular magnetic layer driven by spin Hall effect 2023 Chin. Phys. B 32 057503
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