Micromagnetic Simulation of Complex Permeability for Nanocrystalline Alloys under kHz Magnetization

摘要

As a new kind of magnetic material, nanocrystalline soft magnetic alloy has attracted much attention due to its excellent comprehensive soft magnetic properties. In this paper, Fe_73.5Cu₁Nb₃Si_13.5B₉ nanocrystalline alloy is taken as the research object, and its three-dimensional model is constructed by micromagnetic simulation software. The influence mechanism of applied magnetic field frequency (kHz level) and DC bias magnetic field on the high-frequency magnetization process of the alloy material is studied from the mesoscopic scale with the complex permeability as the research parameter. Firstly, in the range of kHz frequency, with the increase of magnetic field frequency, the imaginary part of permeability presents a trend of rapid increase, indicating that the energy loss gradually increases. Secondly, with the increase of the DC bias magnetic field, the real part of the initial permeability shows a decreasing trend, indicating that the stored energy of the material decreases gradually.