Minor loops in magnetization-dependent Preisach models

It is noted that the moving model and the product model have different variations in the height of minor loops and thus a means of differentiating between the models. Measurements show that, for particulate magnetic recording media, the moving model yields more realistic results and that previous reversible magnetization models are inadequate. Two new models for the reversible magnetization that are compatible with the moving model are analyzed. Both models give a symmetrical reversible susceptibility variation along the M-axis, which is not observed experimentally.>