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Informational potentialities of the neural-like micromagnetic structures in polycrystalline garnet films

The formation problem of neural-like micromagnetic structures in a thin film magnetic media for associative memories and pattern recognition devices is considered. The discussion is based on Hopfield's model of a system of collinear magnetic moments interacting arbitrarily in pairs. Haken's finding which showed that the pattern recognition can be interpreted in term of nonequilibrium phase transition is also used. The magnetic materials for micromagnetic neural-like structures, in which patterns can be stored, must have appreciable ferromagnetic properties and be capable of realising many metastable micromagnetic states with a number of nearest interacting magnetic elements. High coercive force garnet films may be classified among such materials. Their grain-structure features make possible the "freezing" of quasi-periodic dynamic micromagnetic structures arising due to far-from-equilibrium phase transition.