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  • Title: Universality classes of the domain-wall creep motion driven by spin-transfer torques.
    Author: Jin MH, Xiong L, Zhou NJ, Zheng B, Zhou TJ.
    Journal: Phys Rev E; 2021 Jun; 103(6-1):062119. PubMed ID: 34271735.
    Abstract:
    With the stochastic Landau-Lifshitz-Gilbert equation, we numerically simulate the creep motion of a magnetic domain wall driven by the adiabatic and nonadiabatic spin-transfer torques induced by the electric current. The creep exponent μ and the roughness exponent ζ are accurately determined from the scaling behaviors. The creep motions driven by the adiabatic and nonadiabatic spin-transfer torques belong to different universality classes. The scaling relation between μ and ζ based on certain simplified assumptions is valid for the nonadiabatic spin-transfer torque, while invalid for the adiabatic one. Our results are compatible with the experimental ones, but go beyond the existing theoretical prediction. Our investigation reveals that the disorder-induced pinning effect on the domain-wall rotation alters the universality class of the creep motion.
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