3 years ago

Rashba spin-orbit torque in magnetic domain walls.

D. Wang, Zhigang Zou, Yan Zhou

Spin-orbit torque in a magnetic domain wall was investigated by solving the Pauli-Schr\"{o}dinger equation for the itinerant electrons. The Rashba interaction considered is derived from the violation of inversion symmetry at interfaces between ferromagnets and heavy metals. In equilibrium, the Rashba spin-orbit interaction gives rise to a torque corresponding to the Dzyaloshinskii-Moriya interaction. When there is a current flowing, the spin-orbit torque experienced by the itinerant electrons in a short domain wall has both field-like and damping-like components. However, when the domain wall width is increased, the damping-like component, which is the counterpart of the non-adiabatic spin transfer torque, decreases rapidly. In contrast to the non-adiabatic spin transfer torque, the damping-like spin-orbit torque does not approach to zero in the adiabatic limit. A mixture of spin-up and spin-down components in spinor space, which is caused by the Rashba spin-orbit interaction and the spatial variation of magnetization profile in the domain wall, gives rise to the finite, although small, damping-like spin-orbit torque.

Publisher URL: http://arxiv.org/abs/1709.00187

DOI: arXiv:1709.00187v2

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