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Enhanced giant magnetoimpedance effect and field sensitivity in Co-coated soft ferromagnetic amorphous ribbons

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posted on 01.04.2011 by Nicholas Laurita, Anurag Chaturvedi, Christopher Bauer, Priyanga Jaythilaka, Alex Leary, Casey Miller, Manh-Huong Phan, Michael Mchenry, Hariharan Srikanth

A 50 nm-thick Co film has been grown either on the free surface(surface roughness, ∼6 nm) or on the wheel-side surface(surface roughness, ∼147 nm) of Co84.55Fe4.45Zr7B4amorphous ribbons. A comparative study of the giant magnetoimpedance (GMI) effect and its field sensitivity (η) in the uncoated and Co-coated ribbons is presented. We show that the presence of the Co coating layer enhances both the GMI ratio and η in the Co-coated ribbons. Larger values for GMI ratio and η are achieved in the sample with Co coated on the free ribbon surface. The enhancement of the GMI effect in the Co-coated ribbons originates mainly from the reduction in stray fields due to surface irregularities and the enhanced magnetic flux paths closure. These findings provide good guidance for tailoring GMI in surface-modified soft ferromagnetic ribbons for use in highly sensitive magnetic sensors.

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Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article may be found at http://dx.doi.org/10.1063/1.3548857

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01/04/2011

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