TEMPERATURE-DEPENDENT AND TIME-DEPENDENT PREISACH MODEL FOR A STONER-WOHLFARTH PARTICLE SYSTEM

In this paper, a dynamic (time and temperature dependent) Preisach mod el is described. In the Preisach plane one uses a double well potentia l 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, su ch as: field-cooled (FC), zero field-cooled (ZFC), thermo-remanent mag netization (TRM), magnetic relaxation in applied field (MR), and the m ajor hysteresis loop (MHL) as a function of temperature. The results o f the simulations are in good qualitative agreement with experimental data obtained for ferromagnetic ultrafine particulate systems.