Influence of the geometry on the performance of GMI in meander configuration

https://doi.org/10.1016/j.sna.2022.113520Get rights and content
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Highlights

  • Influence of geometry on the GMI response of meanders made with the same samples.

  • Smaller sample distances in meander produce lower reactance and thus, larger GMI.

  • Decrease of reactance is caused by the net negative effect of mutual inductance.

  • The enhancement of GMI ratio in a meander structure is purely a numerical effect.

  • There is no intrinsic improvement in GMI meanders with respect to single samples.

Abstract

The effect of geometry on Giant Magnetoimpedance effect (GMI) in a meander structure composed of three amorphous magnetic ribbons ((Co0.94 Fe0.06)72,5 Si12.5 B15; 20 mm length) connected electrically in series is analyzed. The impedance behavior under the meander configuration is compared with the sum configuration, namely, the sum of the impedance of each ribbon measured individually. The geometry effect in GMI response is examined by changing the distance, D = 0.5, 1 and 2 cm, between ribbons in the meander. The highest GMI ratio is found for D = 0.5 cm, with a gradual decrease for increasing distances. The lowest ratio corresponds to the sum configuration. The analysis of the results shows that this behavior of the GMI ratio, dominated by inductance, is determined by the overall negative contribution of the mutual inductance established between ribbons, and not by any intrinsic modification of the GMI effect in the meander structure.

Keywords

Giant magnetoimpedance
Patterned amorphous ribbons
Mutual inductance
Magnetic field sensor

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J. J. Beato-López was born in Jerez de la Frontera, Spain. He received an M.Sc. degree from the University of Cádiz, Spain, in 2011. Then in 2018, he received the Ph.D. degree in physics (materials science) from the Public University of Navarre, Pamplona, Spain, where he became a Doctor Assistant Professor. His main research interests are related to the study of magnetic properties in materials and their application to the design of sensors.

Nerea Lete obtained her Bachelor's Degree in Electronic Engineering from the University of the Basque Country in 2017, followed by a Master's Degree in Nanoscience and Nanothechnology from the University of Barcelona in 2018. That year she started working on her PhD studies under the supervision of Dr. Alfredo García Arribas and Dr. David de Cos at the Department of Electricity and Electronics of the University of the Basque Country with a grant awarded by the Basque Government (ref. PRE_2018_1_0252). Her studies involve the fabrication of microfluidic channels that incorporate magnetic sensors for the study and detection of magnetotactic bacteria.

Alfredo García-Arribas (male) is currently an associate (tenured) professor at the Universidad of País Vasco UPV/EHU and researcher of BCMaterials. He got his PhD degree at the Universidad del País Vasco, UPV/EHU in 1996, devoted his PhD to the study of the properties of amorphous magnetic materials. His current research activity is focused on the application of magnetic materials in sensors, in particular, those based on magneto-impedance and magneto-elasticity. He leads the research in thin films and micro and nanotechnology within the Group of Magnetism and Magnetic Materials at UPV/EHU.

Cristina Gómez-Polo was born in Madrid, Spain. She received the M.Sc. and the Ph.D.degrees in Physics (Material Science) from the Complutense University, Madrid, Spain, in 1988 and 1992, respectively. In 1995 she joined the Public University of Navarre as a lecturer and become full professor in 2011. Her research activity is mainly focused on the magnetic properties and applications of nanostructured magnetic materials and includes the study of amorphous, nanocrystalline and nanoparticle systems.