CoFe涂覆层对非晶薄带GMI效应的影响

GMI effect in CoFe coated amorphous ribbons

通过直流溅射法在co基非晶薄带（Co66Fe4NiSi15B14）上制备不同厚度的CoFe薄膜层，观察其巨磁阻抗效应（GMI）在120kHz-3MHz频率范围内随外加磁场的变化。实验结果显示：在co基非晶薄带上涂覆CoFe薄膜，可以提高薄带的GMI效应。研究发现，当趋肤效应显著时材料表面粗糙度对GMI效应有较大影响。通过在co基非晶薄带表面镀膜的方式降低样品表面粗糙度，减小表面退磁场的影响，并且闭合样品磁通回路，从而提高样品GMI效应。

We grew a CoFe thin film on the surface of Co-based amorphous ribbon （Co66Fe4NiSi15B14） to investigate the effect of this coating on giant magneto-impedance （GMI）. We investigated GMI over a frequency range of 120kHz-3Nlz and under a static magnetic field. The results show that GMI for amorphous ribbons can be enhanced by this coating process .The study found that surface roughness effect on the GMI when skin effect is significant. The very large enhancement of the GMI value is a consequence of reducing the sample surface roughness, reducing the influence of the surface demagnetizing field and the closed magnetic flux path under the CoFe film layer.