Interaction of two domain walls during spin-torque-induced coherent motion

Abstract

We show that the application of a spin-polarized current to a double p domain wall system with a variable distance between the walls results in an interaction between the two domain walls. The transmission spectrum changes from that of a spin-dependent resonant double barrier to one like a [Formula: see text] wall. In addition, the spin torque on each individual wall creates coupled motion in the domain walls. The walls move independently with a fast speed at large separations, but slow considerably at small separations.

Local spin transfer torque and magnetoresistance in domain walls with variable width

“…Previous studies have shown that scattering from successive sharp DWs can induce non-aligned spin densities which lower the threshold for current induced DW motion and lead to ordering of the DWs. [34][35][36][37] This paper is organized as follows: In Sec. II we present the model and theory to find the STTs in magnetic DWs constrained in nano-contacts, which is used in Sec.…”