An electronic approach to homogenize the impedance phase characteristics of heterogeneous GMI sensors

Abstract

Over the last decade, Giant Magnetoimpedance (GMI) sensors have been studied as a new possibility for measuring ultra-weak magnetic fields. To achieve that goal, the employment and optimization of gradiometric configurations are a key factor to reduce the magnetic interference. The performance of GMI gradiometers is strongly related to the homogeneity of the impedance characteristics of the GMI samples. This work presents a method and corresponding electronic implementation to homogenize the phase characteristics of heterogeneous GMI samples, aiming at improving the performance of phase-based GMI magnetometers.