Influence of temperature on the depinning transition of driven interfaces

Theoretische Tieftemperaturphysik, Gerhard-Mercator-Universität-Duisburg, 47048 Duisburg, Germany

Received: 4 August 1998
Accepted: 8 October 1998

Abstract

We study the dynamics of a driven interface in a two-dimensional random-field Ising model close to the depinning transition at small but finite temperatures T using Glauber dynamics. A square lattice is considered with an interface initially in the (11)-direction. The drift velocity v is analyzed using finite-size scaling at T=0 and additionally finite-temperature scaling close to the depinning transition. In both cases a perfect data collapse is obtained from which we deduce for the exponent which determines the dependence of v on the driving field, for the exponent of the correlation length and for the exponent which determines the dependence of v on T.