Application of the Preisach model to the magnetization process in steels

Up to now the Preisach model of magnetism is supposed to be the best model that can deal with minor loops and predict qualitatively some their features. In general, two necessary properties of the magnetization process (congruence and wiping-out) are usually not fulfilled. It is believed that the Preisach model describes harder magnetic materials better than softer ones. In this work we summarized all our experience in the application of the Preisach model to minor loops experimental data on industrial steels, soft and hard. The deviations of minor loops behaviour from that predicted by the model were combined into several classes; their influence on the resulting Preisach distribution function was determined. All these deviations were found to have the same tendency for both soft and hard steels leading to appearance of nonphysical regions of negative values on the Preisach distribution plane and delta-functions along the Preisach triangle diagonals. These effects were increased several times by the accommodation process.