MAGNETIZATION PROCESSES OF ULTRA-HARD MAGNETIC NANOCOMPOSITES - MODELING AND SIMULATIONS
Grzegorz Ziółkowski – Artur Chrobak
We present models and simulations, based on the Stoner-Wohlfarth and the two-level energetic model, of the magnetization process for high-coercive magnetic nanocomposites. In the investigated system, the magnetic objects with extremely high coer-civity are "frozen" after the first magnetization and being a source of the so-called quenched internal magnetic field. A model accounting a presence of randomly oriented internal magnetic field that influences objects contributing to magnetization pro-cesses of the composite. The results of simulations are in good agreement with experimental data and confirm correctness of the applied model.
Keywords: hard magnet, modelling and simulations, random field, Stoner-Wohlfarth model