NDLI: Co-Based Amorphous Material for Giant Magnetoimpedance and Fluxgate Sensing Cores

Content Provider	IEEE Xplore Digital Library
Author	Sarkar, P. Vcelak, J. Roy, R.K. Panda, A.K. Mitra, A. Ripka, P.
Copyright Year	1965
Abstract	Alloy composition (Co₉₄Fe₆)_72.75Si_12.25B_13.25Cr_1.75 was designed to develop nearly zero-magnetostrictive materials in the form of ribbons and wires to obtain suitable magnetic properties for use as giant magnetoimpedance (GM!) and low-noise fluxgate sensor cores. During the development of magnetic sensing core using amorphous wires of diameter 80 μm for GM! sensing, we observed a maximum impedance change (GMI ratio) of 430% with as-cast wires, which further enhanced to 650% when annealed at 300°C for 5 min. The effect of annealing temperature and stress on the magnetic properties of fluxgate sensing core materials has been studied. Magnetic hysteresis loops were measured with 3-mm-wide and 45-μm-thick amorphous ribbons on a toroidal ring of 50 mm diameter for fluxgate sensor core. A coercivity of 10.57 A/m and saturation field of ~150 A/m were observed with as-quenched ribbon, which improved to a coercivity of 2.16 A/m and saturation field ~100 A/m when annealed without stress just above its Curie temperature. An induced anisotropy transverse to excitation direction was achieved by applying temperature with stress and time (300°C/ 100 MPa/20 min) to use it for fluxgate sensor core.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	846842
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Annealing Stress Wires Magnetic cores Magnetic hysteresis Sensors Coercive force coercivity Giant magneto-impedance fluxgate magnetostriction Coercivity giant magnetoimpedance (GMI)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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