INTERPRETATION OF HYSTERESIS CURVES AND HENKEL PLOTS BY THE PREISACH MODEL

We discuss some properties of the scalar moving Preisach model (MPM) i n relation to the description of magnetic interactions. MPM prediction s for the behavior of Henkel plots are worked out. The role of the fac torization properties of the Preisach distribution and the consequence s of the joint presence of mean-field effects and local random interac tions are discussed. Literature data are analyzed in the frame of this description, with particular attention to thin-film media with perpen dicular magnetization, where mean-field effects are particularly stron g. Some of the theoretical predictions are directly tested by hysteres is and Henkel plot measurements performed on SiFe soft alloys. A good agreement, in some cases involving no adjustable parameters, is found.