Jiles–Atherton model used in the magnetization process study for the composite magnetoelectric materials based on cobalt ferrite and barium titanate

Abstract

This paper presents the use of the Jiles–Atherton model in fitting the major magnetization curves for two classes of composite magnetoelectric materials. These materials are: (BaTiO3)x(CoFe2O4)1–x and (BaTiO3)x(CoMn0.2Fe1.8O4)1–x, with x = 0.8, 0.6, and 0.4. The model’s parameters result from finding the regression curves and give information about the micromagnetic state of the material. The dependencies of the model’s parameters on the ratio of the two phases’ concentrations have been analyzed. The values of the parameters for the two classes of materials have been compared, and the influence of Mn on the magnetic properties has been analyzed. Also presented here are the regression curves for a set of first order reversal curves using the same algorithm as the major magnetization curves. The dependence of the model’s parameters on the reversal field has been analyzed.