磁性复合材料本征高频磁导率的定理：不确定性原则
Law governing the intrinsic high frequency permeability of magnetic composites: Uncertainty Principle
摘要
<p>The intrinsic high frequency permeability spectra of ferromagnetic composites containing different volume fractions of iron and cobalt have been simulated. A law (called “Mghan’s law”) is proposed to explain the simulated results by assuming that there are plenty of LLG (Landau-LifshitzGilbert) type natural resonances contributing to the intrinsic permeability spectra. The results clearly show that the spectra strongly depend on the distribution of local effective magnetic field, the interaction between the magnetic particles, the inhomogeneous damping constant of LLG precession, and the initial equilibrium states. Especially, the effect of particles shape distribution in each sampling on the local effective magnetic field. In view of this fact: it is absolutely impossible to have the same effect from these factors when someone prepares several measurement samples, an uncertainty principle is believed to hold for measuring the absorption properties of an electromagnetic wave composite. Therefore, this law tells us that we should be cautious when we are told the “excellent” absorption properties. Memory effect can be used to restore the intrinsic high frequency permeability for a specific defunct composite sample.</p>
Abstract
<p>The intrinsic high frequency permeability spectra of ferromagnetic composites containing different volume fractions of iron and cobalt have been simulated. A law (called “Mghan’s law”) is proposed to explain the simulated results by assuming that there are plenty of LLG (Landau-LifshitzGilbert) type natural resonances contributing to the intrinsic permeability spectra. The results clearly show that the spectra strongly depend on the distribution of local effective magnetic field, the interaction between the magnetic particles, the inhomogeneous damping constant of LLG precession, and the initial equilibrium states. Especially, the effect of particles shape distribution in each sampling on the local effective magnetic field. In view of this fact: it is absolutely impossible to have the same effect from these factors when someone prepares several measurement samples, an uncertainty principle is believed to hold for measuring the absorption properties of an electromagnetic wave composite. Therefore, this law tells us that we should be cautious when we are told the “excellent” absorption properties. Memory effect can be used to restore the intrinsic high frequency permeability for a specific defunct composite sample.</p>关键词
磁导率/微磁学模拟/阻尼系数/自然共振/磁导率记忆效应Key words
permeability/micromagnetics simulation/damping constant/natural resonance/permeability memory effect引用本文复制引用
.磁性复合材料本征高频磁导率的定理：不确定性原则[EB/OL].(2022-09-24)[2026-04-05].https://chinaxiv.org/abs/202209.00137.学科分类
电工材料/物理学/电子元件、电子组件
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