Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect

Abstract

We theoretically study the current-induced dynamics of a transverse magnetic domain wall in bi-layer nanowires consisting of a ferromagnet on top of a nonmagnet having strong spin-orbit coupling. Domain wall dynamics is characterized by two threshold current densities, $J_{th}^{WB}$ and $J_{th}^{REV}$, where $J_{th}^{WB}$ is a threshold for the chirality switching of the domain wall and $J_{th}^{REV}$ is another threshold for the reversed domain wall motion caused by spin Hall effect. Domain walls with a certain chirality may move opposite to the electron-flow direction with high speed in the current range $J_{th}^{REV}<J<J_{th}^{WB}$ for the system designed to satisfy the conditions $J_{th}^{WB}>J_{th}^{REV}$ and α> β, where αis the Gilbert damping constant and βis the nonadiabaticity of spin torque. Micromagnetic simulations confirm the validity of analytical results.

15 pages, 3 figures

References in corpus (3)

• Direct electronic measurement of the spin Hall effect
• High domain wall velocities induced by current in ultrathin Pt/Co/AlOx wires with perpendicular magnetic anisotropy
• Current-induced domain wall motion in a nanowire with perpendicular magnetic anisotropy

Cited by in corpus (7)

• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Determination of intrinsic spin Hall angle in Pt
• Angular and temperature dependence of current induced spin-orbit effective fields in Ta/CoFeB/MgO nanowires
• Enhanced spin-orbit torque via modulation of spin current absorption
• Large voltage-induced modification of spin-orbit torques in Pt/Co/GdOx
• Angular dependence of spin-orbit spin transfer torques
• Spin-orbit-torque driven magnetoimpedance in Pt-layer/magnetic-ribbon heterostructures