Abstract
The giant magnetic-impedance (GMI) effect in FeCoSiB thin films was investigated. By introducing the role of demagnetizing field, based on linear Maxwell’s equations and Landau-Lifshitz-Gilbert (LLG) equation, the expressions of permeability and impedance were obtained and the theoretical model in this paper was significantly improved. A numerical simulation was conducted using MATLAB. For the thickness of thin film being close to the skin depth when the frequency of alternating current was up to megahertz, it could be found that the calculation results could match the experimental data very well when the thickness of the FeCoSiB thin film was greater than skin depth, while when the thin film thickness was less than skin depth, the calculation results had a big distortion. The influence of the demagnetization factor of FeCoSiB thin films on the GMI effect was also researched. This work was a tentative research on the simulation of the GMI effect of thin films. It might provide an attempt on the theoretical calculation of the GMI effect of thin films and guidance for the fabrication of thin-film GMI sensors.
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