Interface roughening in driven magnetic systems with quenched disorder

Abstract

The kinetic roughening of a driven interface between spin-up and spin-down domains in a model with a nonconserved scalar order parameter and quenched disorder is studied numerically within a discrete time dynamics at zero temperature. Starting from a flat interface in a two-dimensional system the time evolution of the height correlation function is analyzed for different driving fields. It is found that the normal dynamic scaling ansatz is not sufficient to describe the observed behavior. The data are analyzed within a novel scaling ansatz. Arguments are given that the present model belongs to the Edwards-Wilkinson universality class with exponents, depending on the driving field, which is due to correlated effective noise. \textcopyright{} 1996 The American Physical Society.