铁基纳米晶合金介观结构的等效RLC并联模型

Equivalent parallel RLC model in the mesoscopic structure of nanocrystalline Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 alloy

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νextGMI=νRe(D)=0,决定因素有μ,σ,ω,R和Hex及微观磁结构.

Based on the AFM observation of the mesoscopic structure and the XRD experimental results of Fe73.5 Cu1 Nb3Si13.5 B9 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 Fe73.5 Cu1 Nb3 Si13.5 B9 nanocrystalline alloy. With the frequency function, we succeeded in exploring the influence of the frequency on the soft magntic properties of Fe73.5 Cul Nb3 Si13.5 B9 nanocrystalline alloy. Analysis shows that the D- function is a complex function, the real part Re（D） shows the inductance and capacitance of nanocrystalline Fe73.5 CU1 Nb3 Si13.5 B9, the imaginary part Im（D） shows its resistance. We have built an equivalent parallel RLC model for the mesoscopic structure of Fe73.5 CUl Nb3 Si13.5 B9 nanoerystalline alloy. Based on the model we have calculated V extGMI = v ｜Re（D）= 0 , which is the condition of maximum GMI value for Fe73.5 Cu1 Nb3 Si13.5 B9 nanocrystalline alloy, as well as influence of the factors u, σ, ω, R, Hox and the micro-magntic- structure on the maximum GMI value.