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Tailoring of Magnetic Properties of Glass coated Microwires

Published online by Cambridge University Press:  21 March 2011

A.P. Zhukov ,
J. González ,
V. Zhukova  and
J.M. Blanco
A.P. Zhukov
Affiliation:
Donostia International Physics Centre, P. M. de Lardizabal 4, 20018 San Sebastián, Spain “TAMag” S.L., C/ José Abascal 53, Madrid, Spain
J. González
Affiliation:
Dept. Material Physics, Chemistry Faculty, P.O. Box 1072, 20080 San Sebastián, Spain
V. Zhukova
Affiliation:
Dept. Material Physics, Chemistry Faculty, P.O. Box 1072, 20080 San Sebastián, Spain
J.M. Blanco
Affiliation:
Dept. Appl. Phys. I, EUITI, UPV/EHU, Avda Felipe IV 1B, 20011, San Sebastián (Spain)
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Abstract

The magnetic behaviour of the glass-covered metallic microwires with a wide compositional range of composition with soft and hard magnetic character is presented. The effect of conventional furnace and dc current annealing under dc axial magnetic field or without it as well as of a chemical etching on the magnetic properties of Co and Fe-based glass coated microwires has been studied. Such treatments modify the magnetic parameters. In particular, annealing under applied magnetic field (field annealing) can improve significantly such magnetic parameters as permeability. Such phenomenology can be interpreted considering the noticeable magnetic anisotropy induced by the combined effects of the magnetic field and strong internal stresses arising from the coating. Giant magnetoimpedance (GMI) effect was observed in nearly-zero magnetostrictive amorphous microwires. Upon careful heat treatment, FeCuNbSiB amorphous microwires devitrificate into nanocrystalline structure with large variety of magnetic parameters. Hard magnetic materials with coercivity up to 800 Oe were obtained as a result of decomposition of metastable phases in Co-Ni-Cu microwires as well as after crystallization process of FeCuNbSiB amorphous microwires.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , U7.5
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

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