Effect of Electric Current on Domain Wall Dynamics

Abstract

In this paper, we determine the domain wall velocity in the low field regime and study the domain wall dynamics in Joule-annealed amorphous glass-covered microwires with positive magnetostriction. Such microwires are known to present magnetic bi-stability when axially magnetized. In order to measure the domain wall dynamics, an electrical current was applied to the wire simultaneously to the driving magnetic field. When the dc current is applied to the sample, an increase or a decrease is observed on the axial domain wall velocity, depending on the current direction. These results are explained in terms of the change in the magnetic energy promoted by the additional Oersted field which, by its time, modifies the length of the conical domain wall, in such a way that the orthogonal domain wall velocity is not changed by the applied current.