Abstract
A variety of different models and Monte Carlo algorithms are used tostudy the magnetization reversal in thin films with perpendicular magnetization.The thin film is represented by a two-dimensional micromagnetic grid or arrayof classical Ising spins, with long-range dipolar and a short-range effectiveexchange interaction arising from the contribution of the domain-wall energy.The selection of an appropriate model requires some knowledge of the defectsthat may be present in the film and their mechanism of interaction with thedomain boundary. Magnetic viscosity and equilibrium domain structures aresimulated using the Metropolis algorithm with or without an additional energybarrier. Other algorithms are useful when the process of nucleation and growthof magnetic domains involves a wide distribution of relaxation times. We studythe relationship between the methods and discuss their relative merits and rangeof application.
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