Simulation of Unsaturation Domain Formation in Antiferromagnetic Multilayers M. Major, L. Bottyán and D.L. Nagy KFKI Research Institute for Particle and Nuclear Physics, P.O.B. 49, 1525 Budapest, Hungary Received: November 19, 2001 A two-dimensional phenomenological model of patch-domain formation on unsaturation in strongly coupled tri- and multilayer antiferromagnets is presented. Domain patterns are simulated using a fast Monte Carlo algorithm. As a first example the autocorrelation function of the simulated domain pattern is compared with that of a measured Kerr image. PACS numbers: 75.70.Kw, 75.40.Mg, 78.20.Ls, 75.25.+z