The giant magnetoimpedance effect (GMI) attracts much attention mainly due to possible applications (e.g. miniaturized magnetometers) [1-4]. In the present work, the GMI-effect was studied in Co-based low magnetostrictive metallic glass ribbons of different widths. As-quenched, stress-relaxed and partially crystallized samples, with the properties modified by thermal treatment, were studied. The purpose of these processes was to optimize the GMI-effect in the ribbon in respect to its application as a magnetic sensing element. Isothermal annealing process (200 - 550°C) leads to changes in magnetic and magneto-impedance characteristics of the ribbon because of the structural relaxation or precipitation of new crystalline phases in the amorphous matrix. The magnetization characteristics and dependences of the impedance (two components: R and X) on a DC-magnetic field at various frequencies of an AC-current (0.1 - 500 MHz) have been measured. A possibility of tailoring of magnetoimpedance effect has been demonstrated, e.g. high temperature annealing can lead to partial re-crystallization and very high value of (dZ/dH) near the maxima of impedance. This work was in part financed by the Polish Ministry of Education and Science as a Targeted Research Project, over the period 2005–2008 (Project PBZ-KBN-115/T08/01).

[1] R.S. Beach, A.E. Berkowitz, J. Appl. Phys. 76 (1994) 6209-6213.
[2] L.V. Panina, K. Mohri, K. Bushida, M. Noda, J. Appl. Phys. 76 (1994) 6198-6203.
[3] M. Knobel, M. Vázquez, L. Kraus, “Giant magnetoimpedance”, Handbook of Magnetism and Magnetic Materials, edited by K. H. J. Buschow (Elsevier, New York, 2003), Vol. 15, p. 497-563.[4] L. Kraus, Sens. & Act. A 106 (2003) 187-194.

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