Giant magnetoimpedance effect in soft magnetic alloys for magnetic sensors
|Marek Kuźmiński 1, Jacek Gierałtowski 2, Saida Nabily 2, Vladimir P. Dyakonov 1,3|
1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
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).
 R.S. Beach, A.E. Berkowitz, J. Appl. Phys. 76 (1994) 6209-6213.
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