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Influence of Frequency and Bias Current on Asymmetrical GMI Effect in Co71.8Fe4.9Nb0.8Si7.5B15 Amorphous Glass-Covered Wires

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Abstract

The Co71.8Fe4.9Nb0.8Si7.5B15 amorphous glass-covered wires (AGCW) are prepared by the Taylor-Ulitovsky technique. The frequency dependence of asymmetrical giant magneto-impedance (AGMI) effect in amorphous glass-covered wires annealed by 70 mA DC current is here presented. The resistance R and the reactance X have been measured, respectively. The real part R and the imaginary part X of impedance play an important role at high frequency and low frequency, respectively. The influence of DC bias current from Ib = 0 mA to Ib = 5 mA at 30 MHz on the GMI effect in the glass-covered wires annealed by 70 mA DC current is investigated. The asymmetry becomes the largest around Ib=1 mA, and finally decreases for the larger bias current Ib=5 mA. The maximum ΔZ/Z ratio of 310% is observed at 58 MHz under 1 mA bias current.

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Authors and Affiliations

  1. Nanomaterials Engineering and Research Center, Central Iron and Steel Research Institute, Beijing, 100081, China

    Zheng Chen (Doctor), De-ren Li, Zhi-chao Lu & Shao-xiong Zhou

  2. Research and Development Center, Advanced Technology and Materials Co Ltd, Beijing, 100081, China

    Zheng Chen (Doctor), De-ren Li, Zhi-chao Lu & Shao-xiong Zhou

Authors
  1. Zheng Chen
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  2. De-ren Li
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  3. Zhi-chao Lu
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  4. Shao-xiong Zhou
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Correspondence to Zheng Chen.

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Foundation Item: Item Sponsored by the National High-Tech Research and Development Program of China (2002AA302601) and the National Key Technologies Research and Development Program of China (2004BA310A51)

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Chen, Z., Li, Dr., Lu, Zc. et al. Influence of Frequency and Bias Current on Asymmetrical GMI Effect in Co71.8Fe4.9Nb0.8Si7.5B15 Amorphous Glass-Covered Wires. J. Iron Steel Res. Int. 15, 91–94 (2008). https://doi.org/10.1016/S1006-706X(08)60039-4

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  • DOI: https://doi.org/10.1016/S1006-706X(08)60039-4

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