On-line Magazine 'Sensors & Transducers' (S&T e-Digest)

    (ISSN 1726- 5479)

Vol. 65, Issue 3, March 2006, pp. 515-520

Novel Magnetic Field Meter Based on Giant Magneto-impedance (GMI) Effect

K. Nesteruk, M. Kuźmiński and H. K. Lachowicz

Institute of Physics, Polish Academy of Sciences,

Al. Lotników 32/46, 02-668 Warszawa, Poland

Tel.: +48-22-843 6601-3366, E-mail: neste@ifpan.edu.pl

Received: 13 March 2006  Accepted: 22 March 2006  Published: 27 March 2006

Abstract. A novel magnetic field GMI-sensor/meter has been invented and designed. Its laboratory model was constructed and tested, demonstrating the sensitivity of 1^.10^–8 T (100 mGs). The principle of operation of this meter is based on changes of the quality factor of the resonance circuit a part of which is a magnetic GMI sensing element.These changes are due to variations in the real component of the impedance of this element caused by an external DC-field. The sensing element is in the form of a piece of the “non-magnetostrictive” amorphous ribbon. Magnetic field modulation of an acoustic frequency and feedback circuit (compensating field) applied to the device, significantly increases stability and linearity of the measuring system.

Keywords: magnetic field sensor, giant magneto-impedance, metallic glass

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