Detailed investigation of the GMI in a commercial soft-ferromagnetic amorphous alloy

Abstract An investigation of the giant magnetoimpedance effect (GMI) in pieces of a commercial alloy METGLAS 2705 M is presented. The GMI measurements were carried out in as-quenched and annealed samples. The composition C of the samples was investigated by energy-dispersive X-ray spectrometer (EDS) and ferromagnetic resonance has been measured in the X-band (9.5 GHz). It is found that C departs from the nominal value when the electron beam is swept from the center of the ribbon to the edge. On the other hand, while the annealing increases the GMI it decreases the FMR linewidth. Despite the inhomogeneity in the composition it was also found that the GMI is larger in wider samples.