Current Induced Fingering Instability in Magnetic Domain Walls
  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. 
Jon Gorchon, Javier Curiale, Andrejs Cebers, Aristide Lema\^itre,   Nicolas Vernier, Mathis Plapp and Vincent Jeudy
cond-mat.mtrl-sci