INTERFACE ROUGHENING IN DRIVEN MAGNETIC SYSTEMS WITH QUENCHED DISORDER

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 dynam ics at zero temperature. Starting from a hat interface in a two-dimens ional system the time evolution of the height correlation function is analyzed for different driving fields. It is found that the normal dyn amic scaling ansatz is not sufficient to describe the observed behavio r. The data are analyzed within a novel scaling ansatz. Arguments are given that the present model belongs to the Edwards-Wilkinson universa lity class with exponents, depending on the driving field, which is du e to correlated effective noise.