Preisach parameter identification for systems with negative mean field interactions

This paper presents the testing of a recently developed Preisach identification algorithm. The algorithm uses the properties of the integral generalized ΔM plot that is very sensitive to interactions and thus produces a more accurate choice of parameters. The parameters obtained in the identification produce simulations that fit first- and second-order magnetization processes with reasonable precision. For some of the metal particle recording media studied with negative ΔM curves, a good fit can only be obtained using negative mean field interactions. This is different from most acicular systems where a positive. mean term is usually required.