Growth kinetics of a nonequilibrium Ising model

The growth kinetics of a system with spin-exchange dynamics has been invest igated by means of computer simulations. These systems are used to simulate diffusive processes and kinetic phenomena far away from equilibrium. As a measure of growth we have studied the mean square displacement (<R-2> of ta gged particles. It is found that <R-2>t(1-n) follows a sublinear time depen dence, which is explained in terms of the changes of the distribution of at oms between sites within the ordered region and sites of the domain boundar ies. The time-dependence of the diffusion coefficient has been derived. The analogies to the relaxation in disordered systems, such as in a:Si-H and i n O/W(110), is discussed.