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

An investigation of the giant magnetoimpedance effect (GMI) in pieces of a commercial alloy METGLAS 2705 M is presented. The GMI measurements were car ried out in as-quenched and annealed samples. The composition C of the samp les was investigated by energy-dispersive X-ray spectrometer (EDS) and ferr omagnetic 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 annealin g increases the GMI it decreases the FMR linewidth. Despite the inhomogenei ty in the composition it was also found that the GMI is larger in wider sam ples. (C) 2001 Elsevier Science B.V. All rights reserved.