Magnetoimpedance of Electroplated Wires with Large Core Diameters

J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (06): 825-828.

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Magnetoimpedance of Electroplated Wires with Large Core Diameters

C. Sirisathitkul¹⁾, P. Jantaratana²⁾

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:2008-05-19 Revised:2009-04-13 Online:2009-11-28 Published:2009-11-24
Contact: C. Sirisathitkul
Supported by:
the Walailak University's Research Unit Fund

Abstract

Abstract:

Monolayered Co and trilayered Co/Cu/Co were electroplated on 485 μm-diameter Cu wires using the bath pH 2.5. These wires can be functioned as magnetic sensors owing to their magnetoimpedance (MI) effect. By measuring at four different frequencies (100, 250, 500, and 1000 kHz) and Co thicknesses (2.5, 5.0, 10.0, and 25.0μm), the MI ratio of electroplated Co on Cu wires tended to increase with increasing Co thickness and frequency of the driving current. The Co/Cu/Co on Cu wires exhibited even higher MI ratio. The magnetic layer also regulated the magnetic inductions and anisotropy regardless of the size of nonmagnetic core. Nevertheless, the diameter of the Cu core had a significant effect on the MI ratio. By comparing with the 47.7μm-diameter Ag cores electroplated by Co and Co/Cu/Co of the same thickness, the Cu cores with a larger diameter gave rise to a larger MI ratio because their lower electrical resistance enhanced the crossing effect. Substantial MI ratio was observed even in a low frequency regime because the skin effect occurred at a low frequency in the case of electroplated wires with large core diameters.

Key words: Magnetoimpedance, Electroplated wire, Copper, Cobalt

C. Sirisathitkul,P. Jantaratana. Magnetoimpedance of Electroplated Wires with Large Core Diameters[J]. J Mater Sci Technol, 2009, 25(06): 825-828.

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Magnetoimpedance of Electroplated Wires with Large Core Diameters

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