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

钢铁研究学报(英文版), 2008, 15(2): 91-94.

^1, , ^2, , ^3, , ^4,

1.Nanornaterials Engineering and Research Center, Central Iron and Steel Research Institute, Beijing 100081, China;Research and Development Center, Advanced Technology and Materials Co Ltd, Beijing 10008t, China

2.Nanornaterials Engineering and Research Center, Central Iron and Steel Research Institute, Beijing 100081, China;Research and Development Center, Advanced Technology and Materials Co Ltd, Beijing 10008t, China

3.Nanornaterials Engineering and Research Center, Central Iron and Steel Research Institute, Beijing 100081, China;Research and Development Center, Advanced Technology and Materials Co Ltd, Beijing 10008t, China

4.Nanornaterials Engineering and Research Center, Central Iron and Steel Research Institute, Beijing 100081, China;Research and Development Center, Advanced Technology and Materials Co Ltd, Beijing 10008t, China

基金项目: 国家高科技研究发展项目(2002AA302601) 国家重点技术研究发展项目(2004BA310A51)

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

CHEN Zheng ^1, , LI De-ren ^2, , LU Zhi-chao ^3, , ZHOU Shao-xiong ^4,

Keywords： giant magneto-impedance

The 71.8Fe4.9Nb0.8Si7.5B15 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 △Z/Z ratio of 310% is observed at 58 MHz under 1 mA bias current.

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

参考文献