采用脉冲电沉积工艺在直径为200μm的铜丝表面沉积铁镍合金镀层,形成具有同轴电缆结构的巨磁阻抗复合丝材料.分别改变复合丝磁性外壳厚度与铜丝直径,研究复合丝结构对巨磁阻抗效应的影响.发现巨磁阻抗比值随磁性外壳厚度的增大及铜丝直径的增大而增大,特征频率则向低频端移动.本文还发现在外加直流磁场低于5.57kA/m时,驱动交流电幅值增大,巨磁阻抗效应增大;高于5.57kA/m时,驱动交流电幅值的大小几乎不再影响复合丝的巨磁阻抗效应.在驱动电流上叠加20mA以下的直流偏置对巨磁阻抗效应没有影响.
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