Influence of classical electromagnetic effects on current-induced domain wall motion in a perpendicularly magnetized nanowire

Abstract

The influence of classical electromagnetic effects such as applied current field and eddy current field on current-induced domain wall motion in a perpendicularly magnetized nanowire was investigated using a micromagnetic framework. The method used to calculate these fields was derived from Maxwell equation in order to estimate the effect of an attached non-magnetic (NM) layer. We demonstrate an applied current field and an eddy current field in a perpendicularly magnetized nanowire with and without a non-magnetic layer. Without a NM layer, the eddy current field causes a small correction in the Gilbert damping with a wall angle dependence. Adding a NM layer enhances the effective Gilbert damping, especially, in terms of wall rotation. Furthermore, an applied current field strongly affects the current-induced domain wall motion, and significantly changes the critical current density and the Walker breakdown.