Generalized integro-differential equation of magnetization reversal dynamics in polycrystals and its application to processes in manganite-based CMR materials

We report on the development of the self-consistent model of magnetization reversal dynamics in polycrystalline materials taking into account magnetodipole interaction, number of domain walls in grains, influence of microinhomogeneities, nucleation and collision of walls. The evolution of angular distribution of magnetic moments and the shape of output voltage produced by impulsive reversal of magnetic core are calculated for the parameters of model corresponding to the bulk composite La0.7Sr0.3MnO3/SrTiO3 with distortions acting as pinning centers for domain walls. (C) 2003 Elsevier B.V. All rights reserved.