マイクロマグネテイックスにょる磁気ヒステリシスのモデリング

摘要

We developed a hysteresis model based on micromagnetics, called the "grain magnetics (GM) model," to apply it to a Ni-Zn ferrite. In the GM model, each grain is modeled as a single domain particle. The magnetization vector in each grain is determined so that the total magnetic energy is minimized. The effect of magnetic domain structures in grains is included in the model by treating the magnetic interactions between the grains as parameters. Magnetic behavior under a high-frequency excitation current with DC bias is calculated with the model. Finally, we mention a size effect that arises in Mn-Zn ferrite at rather high frequency.