铁基纳米晶合金介观结构的等效RLC并联模型

根据实验研究成果提出纳米晶合金软磁性能受其介观结构影响的观点，建立了Fe基纳米晶合金的球状介观结构模型，分别求出只有交变磁场或交变磁场和静磁场作用时纳米晶粒球的频率函数——D函数.分析表明，两种D函数都是复变函数，其实部Re(D)为纳米晶电感性质和电容性质的反映，虚部Im(D)为纳米晶电阻性质的反映，据此建立了Fe基纳米晶合金介观结构的等效RLC并联模型.由该模型求得合金产生极值巨磁电阻的条件为v_extGMI=v|_Re(D)=0，决定因素有μ,σ,ω,R和H_ex及微观磁结构. 关键词： Fe基纳米晶合金 等效RLC并联模型 球状介观结构模型 频率函数

Equivalent parallel RLC model in the mesoscopic structure of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy

Based on the AFM observation of the mesoscopic structure and the XRD experimental results of Fe_73.5Cu₁Nb₃Si_13.5B₉ nanocrystalline alloy, we proposed a model for exploring the influence of the mesoscopic structure on the soft magntic properties of this kind of Fe-based nanocrystalline alloys, and calculate the frequency function——D-function for the soft magntic properties of Fe_73.5Cu₁Nb₃Si_13.5B₉ nanocrystalline alloy. With the frequency function, we succeeded in exploring the influence of the frequency on the soft magntic properties of Fe_73.5Cu₁Nb₃Si_13.5B₉ nanocrystalline alloy. Analysis shows that the D-function is a complex function, the real part Re(D) shows the inductance and capacitance of nanocrystalline Fe_73.5Cu₁Nb₃Si_13.5B₉, the imaginary part Im(D) shows its resistance. We have built an equivalent parallel RLC model for the mesoscopic structure of Fe_73.5Cu₁Nb₃Si_13.5B₉ nanocrystalline alloy. Based on the model we have calculated v_extGMI=v|_Re(D)=0, which is the condition of maximum GMI value for Fe_73.5Cu₁Nb₃Si_13.5B₉ nanocrystalline alloy, as well as influence of the factors μ,σ,ω,R,H_ex and the micro-magntic-structure on the maximum GMI value.