VECTOR PREISACH MODELING

While the scalar Preisach model has long served as a description of hy steretic processes, the response of ferromagnetic materials is essenti ally vector in character and scalar models are likely to fail in impor tant respects for many advanced applications. A 2D vector Preisach mod el has been developed for the simulation of magnetic recording and pla yback 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 direc tions. On the basis of the properties of the single-domain uniaxial pa rticle, the effect of the transverse field is included as the boundary between ''up'' and ''down'' magnetization on the Preisach plane is ca lculated; then the reversible rotation is calculated as well. The perf ormance of the model in describing measured bulk properties is present ed.