NiFe/INSULATOR/CuCOMPOSITE WIRES AND THEIR GIANT MAGNETO-IMPEDANCE EFFECTS

N. Ning, Jianqing Fan, JunJie Wu, H. Chiriac and X. P. Li ()
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N. Ning: Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore
H. Chiriac: National Institute of Research, and Development for Technical Physics, 47 Mangeron Blvd, 700506, Iasi 3, Romania
X. P. Li: Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore

Surface Review and Letters (SRL), 2010, vol. 17, issue 03, 369-373

Abstract: In this work, two types of electrodepositedNi–Fe/insulator/Cucomposite wires, namelyNi–Fe/seed layer/glass coated copper wire (Composite Wire A), andNi–Fe/seed layer/sputteredSiO2/Cu(Composite Wire B), have been fabricated and their giant magneto-impedance effects have been investigated. With different implementations of the insulator layer, the magneto-impedance effect ofComposite Wire A, whose insulator layer is cast from the melt Pyrex, is significantly higher than that ofComposite Wire Bwith an insulator of sputteredSiO2layer. The profile of the insulator layer, as well as the thickness of magnetic layer and the diameter of the conductive core, greatly influences the interaction between the magnetic layer ofNi–Feand the copper core, as shown in their giant magneto-impedance (GMI) effects. The maximum MI ratios obtained fromComposite Wires AandBare 226% at 800 kHz whenHext= 0.87Oe, and 95% at 1 MHz whenHext= 0Oe, respectively. TheComposite Wire Ais a promising candidate for the sensing element of high sensitivity sensors to very weak magnetic field. ForComposite Wire B, further improvement on its GMI effect and sensing performance requires optimization of its geometric parameters and the deposition conditions.

Keywords: Composite wire; electrodeposition; glass-coated wire; magneto-impedance effect (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10014120

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