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2003 S&T e-Digest Contents


Vol. 41, Issue 3, March 2004, pp. 174-180




GMI Effect in Co-rich Glass Coated Microwires for Sensor Applications


Arcady Zhukov1,2*, Karin García3,  Marek Kuzminski4, Valentina Zhukova2,
Henryk Lachowicz 4 , Julian Gonzalez1,2 and Manuel Vazquez3

1Dpto. Física de Materiales, Fac. Química, UPV/EHU, Apdo. 1072, 20080 San Sebastián

Spain, Phone:+34-943-018611, Fax: +34-943-212236, E-mail: wupzhuka@sp.ehu.es

 2 “TAMag Iberica” S.L., Parque Tecnológico de Miramón, Paseo Mikeletegi 52, 1ª Planta, 20009 San Sebastián,

Spain Pnone:+34-943-820606, Fax: +34-943-000990, E-mail: tamagiberica@wanadoo.es

3Instituto de Ciencia de Materiales, CSIC, 28049 Cantoblanco, Madrid, Spain

Pnone:+34-91-3349000, Fax: +34-91-3720623, E-mail: klgarcia@icmm.csic.es

4Institute of Physics, Polish Academy of Sciences, Al.Lotników 32/46, 02-668 Warszawa, Poland

Pnone:+48-22-9437001, Fax: +48-22-8430926


Received: 3 March 2004   /Accepted: 20 March 2004   /Published: 23 March 2004


Abstract: GMI effect of soft magnetic Co67Fe3.85Ni1.45B11.5Si14.5Mo1.7 glass-coated amorphous microwires has been investigated. In the as-prepared sample, maximum GMI ratio, DZ/Zmax depends on the sample geometry, being highest (about 610%) in samples with thinner glass coating. Joule heating has been performed without magnetic filed (CA) under axial magnetic field (MFA). It has been shown, that even in samples with lower DZ/Zmax the Joule heating enabless to enlarge the DZ/Zmax ratio from 380% up to 500%. A strong dependence of DZ/Zmax on annealing time, tann, frequency, f, and amplitude of the driving current, i, has been observed. DZ/Zmax (tann) dependences with f and  i as parameters, showed an increase of the anisotropy field, Hm, increasing tann for CA annealing.  In contrast, MFA results in an increasing of Hm increasing with tann. The observed dependencies have been interpreted in terms of stress relaxation and changes of the magneto-elastic anisotropy induced by the Joule heating.


Keywords: Glass-coated Microwires, Giant Magneto-Impedance, Thermal Treatments


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