Analysis of the Extraordinary Viscous Magnetic Domain Wall Motion in NiFe Films

Abstract

Experimental data, published by Bostanjoglo and Gemünd, on the extraordinary viscous domain wall motion in thin oxidized films of 83 at % NiFe are analyzed. It is assumed that the velocity v of the wall is governed by the interaction of the wall with defects present in the film and that this interaction can be overcome by thermal activation. The activation energy E is calculated from the experimental data v(H, T) (H applied magnetic field, T temperature). E is a unique smooth function of H. From the obtained relation E(H), information on the force‐distance profile of the interaction between defect and wall is derived.