Strain Dependence of Hysteretic Giant Magnetoimpedance Effect in Co-Based Amorphous Ribbon.

Michał Nowicki,Roman Szewczyk,Piotr Gazda,Andriy Marusenkov,Anton Nosenko,Vasyl Kyrylchuk

doi:10.3390/ma12132110

Michał Nowicki, Roman Szewczyk + Show 4 more

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https://doi.org/10.3390/ma12132110

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Abstract

The significant strain dependence of the hysteretic Giant Magnetoimpedance (GMI) effect in a Co67Fe3Cr3B12Si15 amorphous alloy in a low magnetizing field is presented. A simplistic test stand capable of continuous measurements of GMI characteristics under the influence of strain is detailed. Based on the results, a stress-impedance (SI) sensor is proposed, with a gauge factor similar to semiconductor strain gauges but more robust. An effective method of minimizing external magnetic field influence on the SI effect is given.

Highlights

The Giant Magnetoimpedance effect (GMI) [1] has been heavily researched [2,3,4,5,6], mainly as a basis for novel magnetic field sensors [7], which were developed even before the discovery of the ‘giant’ version of the magnetoimpedance (MI) effect [8,9]
A magnetizing H field was generated by a pair of Helmholtz coils powered by a voltage-current converter (RMD-2b, WUT, Warsaw, Poland), which was controlled by a low frequency (LF) triangle wave generator (Channel 2 of SDG 2082X, Siglent, Helmond, The Netherlands)
The hysteretic GMI effect on a Co67Fe3Cr3B12Si15 amorphous alloy was presented in this work, with this effect explaining repeatability errors and asymmetry in GMI characteristics obtained by point-by point methods

Summary

Introduction

The Giant Magnetoimpedance effect (GMI) [1] has been heavily researched [2,3,4,5,6], mainly as a basis for novel magnetic field sensors [7], which were developed even before the discovery of the ‘giant’ version of the magnetoimpedance (MI) effect [8,9]. Many of the works are oriented towards maximization of the GMI coefficient [10], that is, the relative impedance change of the investigated sample under the influence of an external magnetizing field. There is the magnetomechanical effect of impedance change due to mechanical stress in the sample, known as the stress-impedance (SI) [13,14,15,16]. The GMI and SI effects are closely connected, and influence each other

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