Creep motion in a random-field Ising model - art. no. 026113

We analyze numerically a moving interface in the random-field Ising model w hich is driven by a magnetic field. Without thermal fluctuations the system displays a depinning phase transition, i.e., the interface is pinned below a certain critical value of the driving field. For finite temperatures the interface moves even for driving fields below the critical value. In this so-called creep regime the dependence of the interface velocity on the temp erature is expected to obey an Arrhenius law. We investigate the details of this Arrhenius behavior in two and three dimensions and compare our result s with predictions obtained from renormalization group approaches.