激发电流对CoFeSiB非晶丝巨磁阻抗效应的影响
Effect of the excitation current on Giant-Magneto-Impedance effect of
用旋转水中纺丝法制备了直径为140μm的Co68.15Fe4.35Si12.5B15非晶丝，冷拔至75μm后进行张应力退火处理，然后在Agilent 4294A阻抗分析仪上测量非晶丝的阻抗在外磁场下随激发交流电频率和振幅的变化。结果表明，样品在不同频率下表现出不同的巨磁阻抗效应，随着电流频率的升高，样品的阻抗值增大，低频时(f<100kHz)，样品阻抗变化率ΔZ/Z0随磁场单调下降，高频时(f>100kHz)，样品阻抗变化率ΔZ/Z0随磁场先增大后减小，出现峰值；随着电流振幅的升高，(ΔZ/Z0)max移向更低的场，且在I=16mA时，(ΔZ/Z0)max 最大为174％
he Co68.15Fe4.35Si12.5B15 amorphous wire with diameter of 140μm was prepared by the so-called in-rotating-water quenching technique. After drawn to 75μm , the wire was annealed under tension. At last, the change of the GMI on the frequency of the ac current under external magnetic field was measured on Agilent 4294A Precision Impedance Analyzer. The results show that the sample has different GMI effects with different frequency. With the increase of frequency, the impedance of the sample increases. At low frequency(f<100kHz), the GMI ratio ΔZ/Z0 decreases monotonically. At higher frequency(f >100kHz), the GMI ratio ΔZ/Z0 increases first and then decreases, which results in a single peak. With the increase of the amplitude of the ac current, (ΔZ/Z0)max shifts towards lower field. The maximum of (ΔZ/Z0)max reaches 174% at I=16mA.
强文江、郝洁、陈菊芳、郎玉婧、刘春伟、雍树军、黎文安、孙光飞
电工材料
非晶丝巨磁阻抗频率和振幅
amorphous wiresGiant-Magneto-Impedancefrequency and amplitude
强文江,郝洁,陈菊芳,郎玉婧,刘春伟,雍树军,黎文安,孙光飞.激发电流对CoFeSiB非晶丝巨磁阻抗效应的影响[EB/OL].(2007-10-30)[2025-08-10].http://www.paper.edu.cn/releasepaper/content/200710-550.点此复制
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