Influence of stress-annealing on magneto-transport properties in Co-based amorphous ribbons

In this work, the influence of both conventional annealing (performed with or without stress) and dc Joule-heating on magneto-tran sport properties of Co67Fe4Mo1.5Si16.5B11 amorphous ribbons has been studied in the low (up to 10 MHz) and high-frequency region (15 MHz to 6 GHz). The giant magnetoimpedance (GMI) response has been shown to be enhanced in the lower limit of the studied frequency range. All the studied samples displayed a maximum in the impedance behaviour as a function of applied magnetic field usually related to the magnetic anisotropy field. Magneto-transport measurements performed at high frequency confirm the behaviour of displaying a higher GMI response at low-frequency values for all the studied samples. (C) 2003 Elsevier B.V. All rights reserved.