Abstract
Second harmonic amplitude ( V 2f) of Giant Magneto-Impedance (GMI) voltage of (Fe 6Co 94) 72.5Si 12.5B 15 amorphous wires has been studied systematically for as-cast and Joule-heated states. Joule heating was carried out at current densities ( J) of 20–40 A/mm 2 for a period of 1–300 min. The amplitude of the second harmonic voltage ( V 2f) initially increased with J, attained maximum and then decreased. The maximum amplitude of V 2f was observed for the sample annealed at J=25 A/mm 2 for 5 min. The second harmonic peak shifted towards the higher field side with the increase of annealing current density and annealing period ( t p). Few-fold increase in the amplitude of the second harmonic voltage ( V 2f) was observed due to the presence of a small dc bias current ( I b) of amplitude 1 mA. The asymmetry in V 2f was also observed in a Joule-heated sample. The observed asymmetry has been correlated with the bias field generated between the surface crystallized layer and the amorphous core. A small bias current of amplitude of 1 mA was applied along the direction of the applied field to minimize the asymmetry.
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