Magneto-impedance in glass-coated CoMnSiB amorphous microwires

Author

Vazquez, M. ; Zhukov, A.P. ; Aragoneses, P. ; Arcas, J. ; Garcia-Beneytez, J.M. ; Maria, Psiha ; Hernando, A.

Author_Institution

CSIC, Madrid, Spain

Volume

34

Issue

3

fYear

1998

fDate

5/1/1998 12:00:00 AM

Firstpage

724

Lastpage

728

Abstract

A magneto-impedance (MI) effect has been experimentally detected and systematically studied in Co_68.5Mn_0.5Si₁₀B₁₅ glass-coated amorphous microwire 14 μm in diameter. The dependence of MI on a dc applied magnetic field (up to 20 Oe) for a range of values of ac current (less than 4 mA and having a frequency between 0.2 and 2.0 MHz) flowing along the microwire has been measured in as-prepared samples, as well as after heat treatments up to 400°C. A maximum relative change in MI of around 16% is observed in the optimum conditions, that is, for about 5 Oe dc axial applied field and 3 mA, 2 MHz ac current flowing along the microwire, which finally corresponds to a magnetic field sensitivity of about 0.4 V/Oe. Such modifications are interpreted considering the dependence of the skin-effect on those parameters through the induced changes in the circular permeability. MI in these ferromagnetic wires with micrometric dimension is of technological interest for local detection of magnetic fields

Keywords

amorphous magnetic materials; boron alloys; cobalt alloys; ferromagnetic materials; giant magnetoresistance; heat treatment; magnetic permeability; manganese alloys; metallic glasses; silicon alloys; skin effect; 0.2 to 2.0 MHz; 14 mum; 4 mA; 400 C; Co_68.5Mn_0.5Si₁₀B₁₅; Co_68.5Mn_0.5Si₁₀B₁₅ glass-coated amorphous microwire; ac current; circular permeability; dc applied magnetic field; dc axial applied field; ferromagnetic wires; glass-coated CoMnSiB amorphous microwires; heat treatments; magnetic field sensitivity; magneto-impedance; micrometric dimension; skin-effect; Amorphous magnetic materials; Amorphous materials; Current measurement; Frequency measurement; Gas detectors; Heat treatment; Magnetic field measurement; Magnetic fields; Permeability; Wires;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.668076

Filename

668076