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

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