International audienc

No abstract

The GMI effect in FeCoSiB thin films was investigated. With introducing the role of demagnetizing field, based on linear Maxwell's equations and Landau-Lifshitz equation, the expressions of permeability and impedance were obtained and the theoretical model in this article was significantly improved. A numerical simulation was conducted using Matlab. For the thickness of thin film was close to the skin depth when the frequency of alternating current was up to MHz, It could be found that the calculation results could match the experiment data very well when the thickness of FeCoSiB thin films was greater than skin depth; while when the thin film's thickness was less than skin depth, the calculation results had a big distortion. The influence of demagnetization factor of FeCoSiB thin films on the GMI effect was also researched. This work was a tentative research on the simulation of GMI effect of thin film. It might provide an attempt on theoretical calculation of GMI effect of thin film and guidance for the fabrication of thin film GMI sensor.

No abstract