铁基纳米晶合金的介观阻抗率及应用  

Mesoscopic impedivity of Fe-based nanocrystalline alloy and its application

作　　者：杨全民[1,2] 许启明[1] 杨燚[3] 方允樟[1] 

机构地区：[1]西安建筑科技大学材料科学与工程学院 [2]连云港师范高等专科学校物理系,连云港222006 [3]华中科技大学文华学院电子与信息工程系

出　　处：《物理学报》2008年第2期1008-1012,共5页Acta Physica Sinica

基　　金：陕西省教育厅科学技术研究计划(批准号:07JC08);江苏省连云港市工业研究开发计划(批准号:GY200403)资助的课题.~~

摘　　要：提出了铁基纳米晶合金介观阻抗率的物理概念,用Maxwell方程组求得其计算公式ρ=-μaA/at/Δ×H,该式表明铁基纳米晶合金的介观阻抗率与材料内部的介观磁场强度H、介观磁矢势A和介观磁导率μ有关,磁矢势A是由介观结构引起的量子力学效应,是由合金的微观结构决定的.这个理论很好地解释了铁基纳米晶粉末、粉芯磁阻抗的磁致频移特性和铁基纳米晶复合结构微丝巨磁阻抗的频致磁移特性.We put forward an physical concep for the mesoscopic impedivity of Fe-based nanocrystalline alloy for the first time, and its formula ρ=-μaA/at/Δ×H, is obtained by using Maxwell system of equations. The formula shows that the mesoscopic impedivity ρ of Fe-based nanocrystalline alloy depends on the mesoscopic magnetic field intensity H, mesoscopic magnetic vector potential A, and mesoscopic permeability μ. The mesoscopic magnetic vector potential A is caused by the effect of quantum mechanics with the mesoscopic structure in the studied material, and is determined by the microcosmic structure of the studied material. Magneto-resonance frequency shift of nanocrystalline Fe73.5 Cu1 Nb3Si13.5 B9 powder for its giant magneto-impedance （GMI） effect and frequency resonance magnetic field intensity shift of nanocrystalline Fe73.0Cu1.0 Nb1.5 V2.0Si13.5 B9.0 microwire with the muhilayer structure for its GMI effect are explained successfully by the formula.

关 键 词：介观阻抗率 铁基纳米晶合金 概念 磁矢势A 频致磁移特性 

分 类 号：O482[理学—固体物理]