Dependence of Transverse Domain Wall Dynamics on Permalloy Nanowire Dimensions

Micromagnetic modeling was used to investigate transverse domain wall propagation through Permalloy nanowires of width, w, between 10 and 120 nm and thickness, T, between 2 and 20 nm. The transverse wall mobility below Walker breakdown, ??, and Walker breakdown field, H _w, depended on the exact wire dimensions, rather than simply a function of w/T, as suggested by 1-D analytical modeling. Empirical equations describing the w and T dependence of ?? and H _w were found from the micromagnetic data. As the model makes no assumptions about magnetization uniformity, these equations provide a generic description of ?? and H _w for transverse domain walls in Ni₈₀Fe₂₀ nanowires.