Giant Magnetoimpedance Effect and AC Magnetic Susceptibility in Amorphous Alloys System of FeCoNbBSiCu

Abstract

The study of Giant Magnetoimpedance (GMI) effect of the amorphous alloys system of Fe 72-x Co x Nb 6 B 10 Si 11 Cu 1 (for x = 35 and x = 40 at. percent Co) and AC magnetic susceptibility for the amorphous alloy of Fe 37 Co 35 Nb 6 B 11 Si 10 Cu 1 composition are presented in this chapter. The importance of GMI effect for the improvement of technological applications in sensor devices in amorphous magnetic Fe-and Co-based alloys is introduced; then it is described as the experimental procedure of magnetoimpedance and AC magnetic susceptibility measurements. The obtained results are discussed and finally the conclusions are presented.

Asymmetric magnetoimpedance in exchange-biased systems

“…Considering that the higher the measuring frequency, the smaller the sample's size must be (around 5 mm in the GHz range), the proper orientation of the sample in the experimental setup imposes additional difficulties. Inadequate sample orientation may produce unexpected features in the obtained data, as an asymmetry between the amplitudes of the MI maxima at H > 0 and H < 0 [29,[31][32][33][34]. Some works, using magnetization and rotational susceptibility calculations, have proposed the fitting of Z × H curves at HFs [4,35].…”