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Sensors 2017, 17(3), 640;

The Impact of Bending Stress on the Performance of Giant Magneto-Impedance (GMI) Magnetic Sensors

Université Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Université Grenoble Alpes), G2Elab, F-38000 Grenoble, France
Author to whom correspondence should be addressed.
Academic Editors: Nicole Jaffrezic-Renault and Gaelle Lissorgues
Received: 9 December 2016 / Revised: 7 February 2017 / Accepted: 10 March 2017 / Published: 20 March 2017
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in France 2016)
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The flexibility of amorphous Giant Magneto-Impedance (GMI) micro wires makes them easy to use in several magnetic field sensing applications, such as electrical current sensing, where they need to be deformed in order to be aligned with the measured field. The present paper deals with the bending impact, as a parameter of influence of the sensor, on the GMI effect in 100 µm Co-rich amorphous wires. Changes in the values of key parameters associated with the GMI effect have been investigated under bending stress. These parameters included the GMI ratio, the intrinsic sensitivity, and the offset at a given bias field. The experimental results have shown that bending the wire resulted in a reduction of GMI ratio and sensitivity. The bending also induced a net change in the offset for the considered bending curvature and the set of used excitation parameters (1 MHz, 1 mA). Furthermore, the field of the maximum impedance, which is generally related to the anisotropy field of the wire, was increased. The reversibility and the repeatability of the bending effect were also evaluated by applying repetitive bending stresses. The observations have actually shown that the behavior of the wire under the bending stress was roughly reversible and repetitive. View Full-Text
Keywords: Giant Magneto-Impedance (GMI); amorphous wire; bending stress; flexible Giant Magneto-Impedance (GMI); amorphous wire; bending stress; flexible

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Nabias, J.; Asfour, A.; Yonnet, J.-P. The Impact of Bending Stress on the Performance of Giant Magneto-Impedance (GMI) Magnetic Sensors. Sensors 2017, 17, 640.

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