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Tailoring of magnetic softness and magnetoimpedance of Co-rich microwires by stress annealing

Abstract: Herein, detailed studies on the influence of stress annealing on the magnetic softness and giant magnetoimpedance (GMI) ratio of Co69.2Fe3.6Ni1B12.5Si11Mo1.5C1.2 glass-coated microwires are provided. As-prepared microwire presents linear hysteresis loops, moderate GMI ratio with double-peak magnetic field dependence and low coercivity (4 A m-1), typically observed for wires with transverse magnetic anisotropy. However, after conventional annealing magnetic hardening and transformation of linear hysteresis loop into rectangular with coercivity about 90 A m-1 is surprisingly observed. It is shown that stress annealing allows preventing magnetic hardening and remarkably improving GMI ratio. Properly stress-annealed samples present better magnetic softness: almost unhysteretic loops with coercivity about 2A m-1 and magnetic anisotropy field about 35 A-m-1. Observed stress-annealing-induced anisotropy is affected by the tensile stresses, applied during annealing and by the annealing temperature. From the frequency dependence of the maximum GMI ratio, the optimum frequency ranges for as-prepared and stress-annealed samples are determined. The observed stress-annealing-induced magnetic anisotropy and associated changes in magnetic properties and GMI effect are discussed in terms of internal stresses relaxation and related modification of the magnetostriction coefficient "back stresses" structural anisotropy, redistribution of internal stresses, and change of spatial distribution of magnetic anisotropy.

 Fuente: Physica Status Solidi (A) Applications and Materials Science, 2021, 218(12), 2100130

Editorial: Wiley-Blackwell

 Fecha de publicación: 01/06/2021

Nº de páginas: 11

Tipo de publicación: Artículo de Revista

 DOI: 10.1002/pssa.202100130

ISSN: 1862-6319,1862-6300

Proyecto español: PGC2018-099530-B-C31

Url de la publicación: https://doi.org/10.1002/pssa.202100130

Autores/as

ZHUKOV, ARCADY

CORTE LEÓN, PAULA

IPATOV, MIHAIL

BLANCO ARANGUREN, JUAN MARÍA

GONZÁLEZ ESTÉVEZ, JULIÁN

ZHUKOVA ZHUKOVA, VALENTINA