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自从在CoFeSiB非晶丝(带)及FeCuNbSiB的纳米晶丝(薄膜)材料中发现巨磁致阻抗效应以来,GMI效应在实际运用中有广阔的前景,而且在理论上探讨GMI的起因也是非常有意义的,所以受到普遍的关注。非晶(纳米晶)软磁合金具有高的磁导率,在一定频率的交流驱动电流作用下,外加直流磁场阻碍了交流电流所感生的磁通量的变化,从而降低磁导率,提高趋肤深度,降低了交流阻抗,引起效应。及非晶薄带在不同的温度下热处理可以形成纳米级软磁合金,降低各向异性常数和磁致伸缩系数,提高磁导率,有利于GMI效应的出现。本文对以上三类材料进行不同温度下的热处理,研究GMI效应随外加磁场及驱动电流频率(f)的变化关系,并探讨GMI的来源。定义。
Since the giant magnetoresistance effect has been found in the nanocrystalline (thin film) materials of CoFeSiB amorphous ribbons and FeCuNbSiBs, the GMI effect has broad prospects for its practical application and it is also theoretically possible to investigate the causes of GMIs Meaning, so by the general concern. Amorphous (nanocrystalline) soft magnetic alloy with high permeability, the AC drive current at a certain frequency, the application of DC magnetic field impede the exchange of current induced by the magnetic flux changes, thereby reducing the permeability and improve skin depth , Reducing the AC impedance, causing the effect. And amorphous ribbon annealed at different temperatures can form nanoscale soft magnetic alloys, reduce the anisotropy constant and magnetostriction coefficient, improve the permeability, is conducive to the emergence of GMI effect. In this paper, the above three kinds of materials were heat-treated at different temperatures to study the GMI effect with the applied magnetic field and drive current frequency (f) of the relationship between the changes, and explore the source of GMI. definition.