J. Phys. IV France 08 (1998) Pr2-199-Pr2-202
Effect of annealing on the giant magneto-impedance in amorphous CoFeSiB ribbons and wiresH. Chiriac1, F. Vinai2, T.-A. Óvári1, C.S. Marinescu1 and A. Stantero1
1 National Institute of R&D for Technical Physics, 47 Mangeron Blvd., 6600 lasi 3, Romania
2 Istituto Elettrotecnico Nazionale Galileo Ferraris, Corso Massimo d'Azeglio 42, 10125 Torino, Italy
The results of the effect of annealing on the giant magneto-impedance response of CoFeSiB amorphous wires and ribbons with nearly zero magnetostriction are reported. The most sensitive magneto-impedance response is given by amorphous wires in every case. Annealing reduces the magnitude of the magneto-impedance both for ribbons and wires, due to the alteration of the favorable transverse domain structure that exists in the as-cast samples. Annealing at more elevated temperatures tends to increase the magneto-impedance almost to its initial value for the as-cast samples, due to the stress relief accompanied by the improvement of soft magnetic properties.
© EDP Sciences 1998