Magnetoimpedance of CoFeCrSiB Ribbon-Based Sensitive Element with FeNi Covering: Experiment and Modeling.

Stanislav O Volchkov,Dmitry A Bukreev,Andrey V Svalov,Anna A Pasynkova,Michael S Derevyanko,Alexander V Semirov,Nikita V Kozlov

doi:10.3390/s21206728

Abstract

Soft magnetic materials are widely requested in electronic and biomedical applications. Co-based amorphous ribbons are materials which combine high value of the magnetoimpedance effect (MI), high sensitivity with respect to the applied magnetic field, good corrosion stability in aggressive environments, and reasonably low price. Functional properties of ribbon-based sensitive elements can be modified by deposition of additional magnetic and non-ferromagnetic layers with required conductivity. Such layers can play different roles. In the case of magnetic biosensors for magnetic label detection, they can provide the best conditions for self-assembling processes in biological experiments. In this work, magnetic properties and MI effect were studied for the cases of rapidly quenched Co67Fe3Cr3Si15B12 amorphous ribbons and magnetic Fe20Ni80/Co67Fe3Cr3Si15B12/Fe20Ni80 composites obtained by deposition of Fe20Ni80 1 μm thick films onto both sides of the ribbons by magnetron sputtering technique. Their comparative analysis was used for finite element computer simulations of MI responses with different types of magnetic and conductive coatings. The obtained results can be useful for the design of MI sensor development, including MI biosensors for magnetic label detection.

Highlights

Magnetic materials are widely used in electronics and biomedical applications [1,2]
Magnetic materials for detectors of small magnetic fields were considered in this research area [5,6]
The experimental studies were combined with computer finite element method (FEM) modeling in the range of the alternating current frequencies of 0.1 to 70 MHz

Summary

Introduction

Magnetic materials are widely used in electronics and biomedical applications [1,2].There are different types of ferromagnets designed for existing and proposed technological applications in in different fields, including medicine [3,4]. Magnetic materials are widely used in electronics and biomedical applications [1,2]. The magnetic effect that ensures the highest sensitivity with respect to an applied magnetic field is the magnetoimpedance (MI) [7,8,9]. It can be used both for detection of the biomagnetic signals closely related to the functional activities of the living systems and magnetic label detection [3,6,10,11]. The first prototype of MI biosensor for the detection of magnetic nanoparticles of iron oxide in commercial water-based stable suspension (ferrofluid) employed a Co-based amorphous ribbon as a magnetic sensitive element [14]. For the magnetic biosensing of the magnetizable labels, flat geometry is crucial because the biochemistry step includes various processes of self-assembling and washing

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