Offset Reduction in GMI-Based Device by Using Double-Frequency Bias-Current Modulation

In this paper, we investigate the effect of temperature variations on the off-diagonal giant magneto-impedance (GMI) response. This paper is based on a theoretical model describing the GMI-based sensor response. The modeling has been extended to include the resistivity dependence versus the temperat...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2019-01, Vol.55 (1), p.1-4
Main Authors: Esper, A., Dufay, B., Saez, S., Dolabdjian, C.
Format: Article
Language:English
Subjects:
Alternating current
Circuits
Current modulation
Drift
Electromagnetism
Electronics
Engineering Sciences
General Physics
Giant magneto-impedance (GMI)
Giant magnetoimpedance
Impedance
Instrumentation and Detectors
long-term stability
Magnetic anisotropy
Magnetic fields
Magnetic resonance imaging
Magnetism
Magnetometers
Modelling
offset reduction
Physics
Reduction
Sensitivity
Temperature
Temperature dependence
Temperature effects
Temperature sensors
Variation
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Summary:In this paper, we investigate the effect of temperature variations on the off-diagonal giant magneto-impedance (GMI) response. This paper is based on a theoretical model describing the GMI-based sensor response. The modeling has been extended to include the resistivity dependence versus the temperature. It allows to calculate both temperature sensitivity and intrinsic magnetic field sensitivity, whose ratio leads to the determination of the magnetic field offset drift versus the temperature. Thanks to an original conditioning circuitry based on a double ac current excitation instead of the classical one, we achieved an improvement of the long-term stability and minimized the sensor temperature dependence. Experimentally obtained results have been compared with the expected offset drift for the classical GMI, and with the expected fluctuation reduction while adopting this technique, showing a relatively good agreement with the proposed modeling.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2018.2871412