Vector Preisach modeling (invited)

Abstract

While the scalar Preisach model has long served as a description of hysteretic processes, the response of ferromagnetic materials is essentially vector in character and scalar models are likely to fail in important respects for many advanced applications. A 2D vector Preisach model has been developed for the simulation of magnetic recording and playback for oriented media. The objectives of the model are (i) faithful reproduction of both scalar and rotational measurements made on bulk material and (ii) calculational efficiency for use in the simulations. Past work on vector hysteresis models is reviewed. The present model is a superposition of Preisach models with different orientation directions. On the basis of the properties of the single-domain uniaxial particle, the effect of the transverse field is included as the boundary between ‘‘up’’ and ‘‘down’’ magnetization on the Preisach plane is calculated; then the reversible rotation is calculated as well. The performance of the model in describing measured bulk properties is presented.