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前言 根据铁磁体技术磁化理论,畴壁位移或磁畴转动对初导磁率的贡献,一般表达为μ_0∞Js~2/keff。式中Js是饱和磁化强度,主要由合金成份决定;keff是总有效各向异性常数。显然,当keff趋于零时,μ_0趋于无穷大。磁致伸缩各向异性和磁晶各向异性,是弱磁场下影响Fe-Ni合金导磁率的主要因素。当合金的磁致伸缩系数λ、磁晶各向异性常数K_1同时近于零,则有高的导磁率。
According to the ferromagnetic theory of magnetization, the contribution of domain wall displacement or domain rotation to the initial permeability is generally expressed as μ_0∞Js ~ 2 / keff. Where Js is the saturation magnetization, mainly determined by the alloy composition; keff is the total effective anisotropy constant. Obviously, when keff tends to zero, μ_0 tends to infinity. Magnetostrictive anisotropy and magnetocrystalline anisotropy are the main factors affecting the magnetic permeability of Fe-Ni alloy in the weak magnetic field. When the magnetostriction coefficient λ, magnetocrystalline anisotropy constant K_1 at the same time close to zero, then there is a high permeability.