Moving Preisach Model Research Articles

The wiping-out property of the moving model (magnetic hysteresis)

Some properties of the moving Preisach model are examined. It is found that this model can introduce hysteresis in materials where it is not intrinsically present. It is shown that the moving model has the wiping-out property, even in the case where a reversible component of magnetization is present in addition to the irreversible component computed by the moving model. The implication of this model to the overwrite problem in magnetic recording is discussed. >

Experimental verification of a vector Preisach model

A vector moving Preisach model has been developed that describes partially oriented particulate media by pseudoparticles, consisting of a distribution of several basic particles with various orientations of easy axes. The model uses switching modes calculated by a micromagnetic simulation of physical particles. In order to test this model, the angular dependence of the magnetic properties was measured by a vibrating sample magnetometer for several samples of commercial recording media that had different degrees of particle orientation. The experimental results are in good agreement with the orientation dependence of the squareness and coercivity, as predicted by the model.

A moving preisach vector hysteresis model for magnetic recording media

Two hysteresis models commonly used in numerical simulations of the recording process are the Preisach model and the particle assembly model. A combination of these models is presented which includes the mean field approach of the moving Preisach model. It is shown how the model can be tailored to enable an efficient numerical implementation. Comparison of the results with different experimental loops of a metal particle tape and a barium ferrite floppy disc reveals that this model has good vector properties and reproduces the different remanence loops well. The different interaction terms in the model are investigated separately. It is shown that the narrow switching field distribution of barium ferrite and the typical interaction phenomena reported by other authors can both be ascribed to a mean field interaction parallel to the particle axis.