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Optimization of magnetic properties and GMI effect of thin co-rich microwires for GMI microsensors

Abstract: Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect improvement was achieved either by annealing or stress-annealing. Annealed Co-rich presents rectangular hysteresis loops. However, an improvement in magnetoimpedance ratio is observed at fairly high annealing temperatures over a wide frequency range. Application of stress during annealing at moderate values of annealing temperatures and stress allows for a remarkable decrease in coercivity and increase in squareness ratio and further giant magnetoimpedance effect improvement. Stress-annealing, carried out at sufficiently high temperatures and/or stress allowed induction of transverse magnetic anisotropy, as well as magnetoimpedance effect improvement. Enhanced magnetoimpedance ratio values for annealed and stress-annealed samples and frequency dependence of the magnetoimpedance are discussed in terms of the radial distribution of the magnetic anisotropy. Accordingly, we demonstrated that the giant magnetoimpedance effect of Co-rich microwires can be tailored by controlling the magnetic anisotropy of Co-rich microwires, using appropriate thermal treatment.

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 Autoría: Gonzalez-legarreta L., Corte-leon P., Zhukova V., Ipatov M., Blanco J.M., Gonzalez J., Zhukov A.,

 Fuente: Sensors, 2020, 20(6), 1558

Editorial: MDPI

 Fecha de publicación: 11/03/2020

Nº de páginas: 17

Tipo de publicación: Artículo de Revista

DOI: 10.3390/s20061558

ISSN: 1424-8220

Proyecto español: PGC2018-099530-B-C31

Autores/as

CORTE LEÓN, PAULA

ZHUKOVA ZHUKOVA, VALENTINA

IPATOV, MIHAIL

BLANCO ARANGUREN, JUAN MARÍA

GONZÁLEZ ESTÉVEZ, JULIÁN MARÍA

ZHUKOV EGOROVA, ARKADY PAVLOVICH