Temperature- and time-dependent Preisach model for a Stoner-Wohlfarth particle system

摘要

In this paper, a dynamic (time and temperature dependent) Preisach model is described. In the Preisach plane one uses a double well potential distribution calculated with the Stoner-Wohlfarth model. Both static and dynamic interactions for a ultrafine particulate system are taken into account in order to simulate various magnetization processes, such as: field-cooled (FC), zero field-cooled (ZFC), thermo-remanent magnetization (TRM), magnetic relaxation in applied field (MR), and the major hysteresis loop (MHL) as a function of temperature. The results of the simulations are in good qualitative agreement with experimental data obtained for ferromagnetic ultrafine particulate systems.