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The influence of static random inhomogeneities on the self-organization of magnetic domains in uniaxial ferromagnetic films
Abstract
For a thick uniaxial ferromagnetic plate, the time required for the transition in the vicinity of the Curie temperature and the time required for the orientational phase transition from the homogeneous to domain phase are estimated. Both transitions are caused by random defects in the plate. The rates of these processes are compared to the rate of self-organization of the strip domain structure at different amplitudes and spatial distributions of the random field produced by defects.
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The transition of a uniaxial ferromagnetic film to the equilibrium state is studied in the case of a sharp change in the external parameters of the system, such as the temperature and external magnetic field. The motion of the dynamic interface between the paramagnetic phase and strip domain structure near the Curie temperature is discussed in terms of the Landau theory. The profile and typical size of the boundary, as well as the velocity of its stationary displacement, are determined by the envelope method. The results are generalized for the case of uniaxial ferromagnetic films near the second-order orientational phase transition from the uniform state to the strip domain structure.