Giant magnetoimpedance effect in soft magnetic alloys for magnetic sensors

Marek Kuźmiński 1Jacek Gierałtowski 2Saida Nabily 2Vladimir P. Dyakonov 1,3

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Université de Bretagne Occidentale, Laboratoire de Magnétisme de Bretagne CNRS, 6 Av. Victor le Gorgeu, Brest 29238, France
3. National Academy of Sciences of Ukraine, Donetsk Technical-Physical Institute, R. Luxemburg 72, Donetsk 83114, Ukraine

Abstract

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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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium C, by Marek Kuźmiński
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-12 23:19
Revised:   2009-06-07 00:48