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Thin magnetic wires for GMI applications

A. ZHUKOV1,2,* , M. IPATOV1, V. ZHUKOVA1

Affiliation

  1. Dpto. de Fís. Mater., UPV/EHU San Sebastián 20009, Spain
  2. IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain

Abstract

Magnetically soft thin amorphous microwires attracted recently great attention because of their excellent soft magnetic properties and giant magneto-impedance (GMI) effect, thin dimensions and possibility for applications in magnetic microsensors. We overview results on development of magnetically soft microwires with high GMI effect and report last results on studies of GMI (diagonal and off-diagonal components) at high frequencies (up to 4 GHz) and correlation of observed GMI effect with soft magnetic behaviour of thin Co-Fe-rich amorphous microwires (metallic diameter between 3 and 20 µm) and on optimization of GMI effect. We observed and analyzed low-field hysteresis of GMI effect and its dependence on circular dc bias magnetic field and discuss the nature the low-field hysteresis in terms of helical magnetic anisotropy and the effect of the bias field. Choosing samples composition, annealing conditions and geometry we were able to tailor their magnetoelastic anisotropy and respectively magnetic softness and GMI.

Keywords

Glass-coated microwires, GMI effect, Magnetoelastic anisotropy.

Submitted at: Jan. 31, 2012
Accepted at: April 11, 2012

Citation

A. ZHUKOV, M. IPATOV, V. ZHUKOVA, Thin magnetic wires for GMI applications, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 3-4, pp. 309-316 (2012)