Field-driven interface dynamics of a random soft-spin Ising model

Abstract

The kinetics of an interface between spin-up and spin-down domains in a soft-spin Ising model with quenched random fields and driving magnetic field H is studied numerically within a discrete time dynamics at zero temperature. Spins are updated in parallel starting from a flat interface. It is found that for fields smaller than a threshold field H_c the interface is pinned while above H_c the mean velocity of the interface increases proportional to (H-H_c) for two- and three-dimensional systems.