The shape instability of magnetic domain walls under current is investigated in a ferromagnetic (Ga,Mn)(As,P) film with perpendicular anisotropy. Domain wall motion is driven by the spin transfer torque mechanism. A current density gradient is found either to stabilize domains with walls perpendicular to current lines or to produce finger-like patterns, depending on the domain wall motion direction. The instability mechanism is shown to result from the non-adiabatic contribution of the spin transfer torque mechanism.
@article{arxiv.1409.1007,
title = {Current Induced Fingering Instability in Magnetic Domain Walls},
author = {Jon Gorchon and Javier Curiale and Andrejs Cebers and Aristide Lemaître and Nicolas Vernier and Mathis Plapp and Vincent Jeudy},
journal= {arXiv preprint arXiv:1409.1007},
year = {2015}
}