Universality class for domain growth in random magnets

Abstract

A 2D Ising model with random ferromagnetic bonds is studied by Monte Carlo simulation following a quench from T= infinity to T(Tc. The domain size grows as L(t) approximately (In t/to)x at late times. The data are consistent with the theoretical prediction chi =4. The exponent, defined by (Si(0)Si(t) approximately L(t)-, and the scaling functions for the spatial correlations, are very close to those of the pure system, suggesting that pure and random systems belong to the same universality class.