Magnetic properties of selected Fe-based soft magnetic composites interpreted in terms of Jiles-Atherton model parameters

Abstract The paper presents the Jiles-Atherton model application to selected Fe-based soft magnetic composites (of different types prepared with the intention of verifying the model), with inner demagnetizing fields consideration implemented. The model fits experimental anhysteretic magnetization curves with very good accuracy, obtaining parameters: the effective domain density, the interdomain coupling and the average magnetic moment of effective domain. The parameters are interpreted in comparison to maximum total and differential permeability, inner demagnetization factor and hysteresis losses. The denser effective domain structure with stronger interdomain coupling is found for the decreasing ferromagnetic filler content and mean particle size, together with higher inner demagnetizing fields, leading to lower number of active magnetic objects, reflected by magnetic properties worsening. The relation of magnetic properties to interdomain coupling strength and effective domain density is specific for each ferromagnetic component of composite. The parameters absolute values are found remarkably different from bulk ferromagnets values in literature, pointing out the specific magnetization reversal of composites.