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Microwires coated by glass: A new family of soft and hard magnetic materials

Published online by Cambridge University Press:  31 January 2011

A. Zhukov ,
J. González ,
J. M. Blanco ,
M. Vázquez  and
V. Larin
A. Zhukov
Affiliation:
Donostia International Physics Center, P.M. de Lardizabal, 4, 20018, San Sebastiá;n, Spain, and TAMag S.L., c/Jose Abascal 53, Madrid, Spain
J. González
Affiliation:
Departamento de Física de Materiales, Facultad de Ciencias Químicas, P.O. Box 1072, 20080 San Sebastián, Spain
J. M. Blanco
Affiliation:
Departamento de Física Aplicada I, Escuela Universitaria de Ingeniería Técnica Industrial, 20011 San Sebastián, Spain
M. Vázquez
Affiliation:
Instituto de Magnestismo Aplicado, Red Nacional de Ferrocarriles Españolas-Universidad Complutense de Madrid (RENFE-UCM), and Instituto de Ciencia de Materiales, Consejo Superor de Investigaciones Cientificas (CSIC), P.O. Box 155, 28230 Las Rozas, Madrid, Spain
V. Larin
Affiliation:
AmoTec, Kishinev, B-d Dacia 15 ap. 78, Moldova
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Abstract

The Taylor–Ulitovski technique was employed for fabrication of tiny ferromagnetic amorphous and nanocrystalline metallic wires covered by an insulating glass coating with magnetic properties of great technological interest. A single and large Barkhausen jump was observed for microwires with positive magnetostriction. Negative magnetostriction microwires exhibited almost unhysteretic behavior with an easy axis transverse to the wire axis. Enhanced magnetic softness (initial permeability, μι, up to 14000) and giant magneto impedance (GMI) effect (up to 140% at 10 MHz) was observed in amorphous CoMnSiB microwires with nearly zero magnetostriction after adequate heat treatment. Large sensitivity of GMI and magnetic characteristics on external tensile stresses was observed. Upon heat treatment, FeSiBCuNb amorphous microwires devitrificated into a nanocrystalline structure with enhanced magnetic softness. The magnetic bistability was observed even after the second crystallization process (increase of switching field by more than 2 orders of magnitude up to 5.5 kA/m). Hard magnetic materials were obtained as a result of decomposition of metastable phases in Co–Ni–Cu and Fe–Ni–Cu microwires fabricated by Taylor–Ulitovski technique when the coercivity increased up to 60 kA/m. A magnetic sensor based on the magnetic bistability was designed.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 10 , October 2000 , pp. 2107 - 2113
Copyright
Copyright © Materials Research Society 2000

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