| As the demands of technology have advanced, the modeling of magnetic hysteresis has become increasingly sophisticated. In particular, the demands of high density magnetic recording have motivated the development of a vector Preisach model to supplant the scalar Preisach model. The combined Preisach-Particle Assembly model was introduced in 1990 by Oti and Della Torre to overcome the deficiencies of earlier attempts at vector hysteresis model. The displaced rectangular loop of the scalar Preisach model is replaced by a displaced Stoner-Wohlfarth astroid and the easy axes of the astroids are distributed in direction to represent the angular dispersion of the material being modeled. Cramer showed that this model, including a magnetization dependent mean field (moving model), can represent the field response of magnetic media with both negative and positive interactions.;For the future, the vector Preisach model will develop into a tool for the efficient design of magnetic systems to take its place within the Computer Aided Design (CAD) toolbox.;The combined model has now been extended to become a fully 3-D magnetization hysteresis model. It is described in detail, including methods for identification of the model for individual media. The models are validated by comparison of a variety of experimentally measured recording media responses, including hysteresis loops, deltaM curves, and rotational behavior such as torque curves at intermediate field values. The model was included in 3-D recording simulations in order to treat phenomena at the track edge that becomes significant for high track densities. This approach has proved itself in predicting the effect of poletip geometry on remanent magnetization distributions and thus, on Servo signals. An application of the model to adjacent track interference is discussed. |
