ENHANCEMENT OF GIANT MAGENTO-IMPEDANCE EFFECT USING LC RESONANCE

In this study, resonance enhancement of giant magneto-impedance (GMI) effect in Fe-based Fe73.5Cu1Nb3Si13.5B9 glass-coated microwires was investigated. A new method was adopted by sputtering a copper layer in the outside of the Fe-based glass-coated wire. A capacitance forms between the ferromagnetic core and outer copper layer, where the glass insulator works as a dielectric layer. Therefore, the composite wire forms an LC resonance circuit (which consists of an inductor, represented by the letter L, and a capacitor, presented by the letter C) itself, resulting in an increase of GMI ratio from 250% to 330%. Meanwhile, the influence of resonance frequency on the GMI effect was discussed.