Enhancement of GMI Effect in Silicon Steels by Furnace Annealing

J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (05): 619-621.

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Enhancement of GMI Effect in Silicon Steels by Furnace Annealing

C. Sirisathitkul, P. Jantaratana

1) Magnet Laboratory, Molecular Technology Research Unit, School of Science, Walailak University, Nakon Si Thammarat 80161, Thailand
2) Electricity and Magnetism Properties Research Laboratory, Department of Physics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand

Received:2008-09-12 Revised:2009-03-02 Online:2009-09-28 Published:2009-10-10
Contact: Chitnarong Sirisathitkul
Supported by:
Walailak University0s research unit fund

Abstract

Abstract:

The ratio and sensitivity of giant magnetoimpedance (GMI) in grain oriented silicon steels (Fe-4.5%Si) are improved after furnace annealing in air for 20 min. By annealing at 800°C, the GMI sensitivity rises from 1.29%/Oe to 1.91%/Oe and the ratio increases from 237% to 294% with decreasing characteristic frequency. The results are attributable to an increase in the transverse magnetic permeability during the heat treatment. From simulation by finite element method, the GMI effect can be interpreted as the modification of the current distribution by the applied magnetic field via the transverse permeability. In the case of annealed samples, the larger transverse permeability allows a higher GMI ratio and sensitivity.

Key words: Silicon steels, Giant magnetoimpedance, Furnace annealing, Skin depth, Transverse permeability

C. Sirisathitkul,P. Jantaratana. Enhancement of GMI Effect in Silicon Steels by Furnace Annealing[J]. J Mater Sci Technol, 2009, 25(05): 619-621.

Enhancement of GMI Effect in Silicon Steels by Furnace Annealing

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