An Experimental System of the Classical Preisach Model of Magnetic Hysteresis

Abstract

The original Preisach model of magnetic hysteresis is based on the properties of single domain particles, switching by a coherent reversal, and interacting magnetostatically. All the properties of the classical Preisach model are illustrated by the example of a regular two-dimensional array of strongly uniaxial magnetic garnet particles, corresponding to the assumptions of the model. The up- and down switching fields of the individual particles, and the macroscopic hysteresis loop of the assembly of a large number of particles were measured. The distribution statistics of the critical fields and interaction fields were determined directly from the data, and the measured major loop data were compared to the calculated one, with a very good agreement. However, shape and size effects of the particles, and the dependence of the standard deviation of the interaction field on the actual magnetization have to be included even in the simplest model.