Analysis of magnetization process of nanocrystalline alloy under different external conditions

Abstract

In order to study the relationship between the movement of magnetic moment and external magnetic field during magnetization of nanocrystalline alloy. Based on G. Herzer’s theory of stochastic anisotropy, a three-dimensional mesoscopic model of nanocrystalline alloy was established by using micromagnetic simulation software. Taking magnetic moment deflection angular velocity $\omega$ as the research parameter, the magnetic moment deflection in the magnetization process of materials is quantitatively investigated, and the function expression between alternating magnetic field and $\omega$ is obtained. The results show that $\omega$ is negative, and its absolute value increases first and then decreases. At the same time, when the amplitude and frequency of external magnetic field increase, the value of $\omega$ increases significantly. When external magnetic field is 20 kHz and 50mT, its $\omega_{max}=0.5099{\mathrm rad/ns}$; When frequency and amplitude are increased to 65 kHz, 95mT, $\omega_{max}=1.9741{\mathrm rad/ns}$, increased by 287.15%. Then, the function relation between $\omega$ and amplitude, frequency is obtained, and verified by simulation results. It is found that the maximal error of the mean value occurs in 60kHz_90mT, and the relative error is 5.28%. The maximal error of maximum value occurs in 65kHz_95mT, and the relative error is 2.08%.