Abstract
Computer simulations of a two-dimensional lattice of magnetic dipoles are performed on the Connection Machine. The 256 x 256 hexagonal lattice is a discrete model for thin films of amorphous rare earth-transition metal (RE-TM) alloys, which have application as the storage media in erasable optical data storage systems. In these simulations the dipoles follow the dynamic equation of Landau-Lifshitz-Gilbert under the influence of an effective field arising from local anisotropy, near-neighbor exchange, classical dipole-dipole interactions, and an externally applied field. Using mean-field theory, we have calculated the temperature dependencies of the subnetwork magnetizations, the effective fields, the gyromagnetic coefficient, and the Gilbert damping parameter. These results are then used in the simulation of the thermomagnetic recording process, where a focused laser beam creates a hot spot and allows an external magnetic field to reverse the direction of local magnetization. The onset of nucleation and the dynamics of growth/contraction by domain wall motion have been studied by means of these simulations.
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