中文摘要：

在Fe-Cu-Nb-Si-B材料中适当增加Cu的含量，可以使淬态薄带纳米化。随薄带中Cu含量的增加，在淬态薄带Fe74.5-xCuxNb3Si13.5B9中可观察到巨磁阻抗效应的增强现象。高Cu含量（x≥2）试样的磁导率的变化率要远大于低Cu含量（x≤1．5）试样的相应数值。磁导率变化的大小与磁阻抗效应相关。高Cu含量有效增加了软磁α-Fe（Si）立方相的成核，提高了淬态薄带材料的软磁性。

英文摘要：

Nano-crystallization in Fe-Cu-Nb-Si-B as-cast ribbons can be obtained by increasing Cu addition. With increasing Cu content, the giant magnetoimpedance effect in Fe-Cu-Nb-Si-B as-cast ribbons is enhanced. The change ratios of both real and imaginary permeability for the Fe74.5-,CuxNb3Si13.5B9 as-cast ribbons are larger with high Cu content （x≥2） than those with lower Cu content （x≤1.5）. The change of permeability is connected with the giant magnetoimpedance effect. The high Cu elements in the as cast ribbon effectively enhances the nucleation of the soft α-Fe （Si） bcc phase, improving soft magnetic properties.