Title: Applications of SV-GMR sensor for detecting micro non-magnetic and ferromagnetic material

Authors: T. Somsak, K. Chomsuwan, S. Yamada, M. Iwahara

Addresses: Faculty of Engineering, Graduate School of Natural Science and Technology, Institute of Nature and Environmental Technology, Kanazawa University, kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan. ' Faculty of Engineering, Graduate School of Natural Science and Technology, Institute of Nature and Environmental Technology, Kanazawa University, kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan; King Mongkut's University of Technology Thonburi, Bangkok, Thailand. ' Faculty of Engineering, Graduate School of Natural Science and Technology, Institute of Nature and Environmental Technology, Kanazawa University, kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan. ' Faculty of Engineering, Graduate School of Natural Science and Technology, Institute of Nature and Environmental Technology, Kanazawa University, kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan

Abstract: This paper describes the application of recognition of micro non-magnetic (conductive) and ferromagnetic materials (Fe) using a Spin-Valve Giant Magneto-Resistance (SV-GMR) as a sensor. High frequency and static magnetic fields were applied to the specimens. The proposed Eddy Current Testing (ECT) probe with a SV-GMR sensor was used to detect the magnetic field variation from the specimens. Experiments were performed to detect both non-magnetic single and array (PbSn, 125 μm radius) using the SVGMR sensor. The analytical results are agreed with the experimental results. Furthermore, the experimental results of magnetic particles (Fe, size of 20–60 μm) were also successfully detected.

Keywords: spin-valve giant magneto-resistance; SV-GMR; conductive material; magnetic material; eddy current testing; ECT.

DOI: 10.1504/IJISTA.2007.014133

International Journal of Intelligent Systems Technologies and Applications, 2007 Vol.3 No.1/2, pp.106 - 118

Available online: 22 Jun 2007

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