Giant magnetoimpedance and stress-impedance effects in multilayered FeSiB/Cu/FeSiB films with a meander structure

Abstract

Giant magnetoimpedance (GMI) and giant stress-impedence (GSI) effects were realized in multilayered FeSiB/Cu/FeSiB films with a meander structure by magnetron sputtering on thin glass substrates. The GMI and GSI effects were studied in the frequency range of 1–40 MHz for the multilayered FeSiB/Cu/FeSiB films. Experimental results show that a large negative GMI ratio of –23% is obtained at Ha=12 kA/m for a frequency of 20 MHz. The GSI ratio is –20% for a frequency of 1 MHz with the deflection of 150μm of the multilayered FeSiBsCu/FeSiB films. The GSI effect is attractive for stress or pressure sensor applications.