Scaling of the Rashba spinorbit torque in magnetic domain walls
Abstract
Spinorbit torque in magnetic domain walls was investigated by solving the PauliSchrödinger 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 spinorbit interaction gives rise to a torque corresponding to the DzyaloshinskiiMoriya interaction. When there is a current flowing, the spinorbit torque experienced by the itinerant electrons in short domain walls has both fieldlike and dampinglike components. However, when the domain wall width is increased, the dampinglike component, which is the counterpart of the nonadiabatic spin transfer torque, decreases rapidly at the domain wall center. In contrast to the nonadiabatic spin transfer torque, the dampinglike spinorbit torque does not approach to zero far away from the domain wall center, even in the adiabatic limit. The scattering of spinup and spindown wave functions, which is caused by the Rashba spinorbit interaction and the spatial variation of magnetization profile in the domain wall, gives rise to the finite dampinglike spinorbit torque.
 Publication:

arXiv eprints
 Pub Date:
 September 2017
 arXiv:
 arXiv:1709.00187
 Bibcode:
 2017arXiv170900187W
 Keywords:

 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 17 pages, 5 figures