利用磁控溅射方法制备了Ni80Fe20 /Cu复合结构丝,过程中给基底Cu丝施加电流,研究了电流对复合结构丝的形貌、磁结构及磁阻抗(Magnetoimpedance,MI)的影响.实验结果表明,施加电流后样品表面形貌趋于平整致密.适当的诱导电流大小和时间能够诱导磁性层产生环向磁结构,降低其等效各向异性场,进而提高样品的MI效应.溅射时间为40min,电流大小为125mA、通电时间30min时,样品的磁阻抗效应最明显.当诱导电流继续增大或电流时间进一步增加时,铁磁层磁结构转为纵向,矫顽力相应增加,阻抗效应降低.利用电流的热效应和磁效应对实验结果进行了有益的分析和讨论.
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