%0 Journal Article
%T Dynamics of Domains in Diluted Antiferromagnets
%A U. Nowak
%A J. Esser
%A K. D. Usadel
%J Physics
%D 1996
%I arXiv
%R 10.1016/0378-4371(96)00133-1
%X We investigate the dynamics of two-dimensional site-diluted Ising antiferromagnets. In an external magnetic field these highly disordered magnetic systems have a domain structure which consists of fractal domains with sizes on a broad range of length scales. We focus on the dynamics of these systems during the relaxation from a long-range ordered initial state to the disordered fractal-domain state after applying an external magnetic field. The equilibrium state with applied field consists of fractal domains with a size distribution which follows a power law with an exponential cut-off. The dynamics of the system can be understood as a growth process of this fractal-domain state in such a way that the equilibrium distribution of domains develops during time. Following these ideas quantitatively we derive a simple description of the time dependence of the order parameter. The agreement with simulations is excellent.
%U http://arxiv.org/abs/cond-mat/9604094v1