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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.
The Co71.8Fe4.9Nb0.8Si7.5B15 amorphous glass-covered wires (AGCW) were 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. 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.