The Giant Magneto-Impedance Effect of Current-Annealed Fe-Based Ribbons
Jun HeHui-qun GuoCheng Li-zhiShen Bao-GenHE KaiyuanYihua Liu(1)东北大学材料科学与工程系，沈阳 110006; (2)山东大学物理系，济南 250100; (3)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080; (4)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080;东北大学材料科学与工程系，沈阳 110006
Abstract
The influence of current annealing process on the giant magneto-impedance (GMI) effect of Fe84Zr8Nb3.5Cu1 ribbons was studied. The obtained results showed that with increasing annealing current, the GMI ratio ΔZ/Z(ΔZ/Z=(Z(H)-Z(Hmax))/Z(Hmax)) is enhanced. The maximal GMI ratio of about 62% is obtained for the sample annealed at 820 mA for 10min, while the sensitivity can reach a value up to about 0.23% (A/m)-1. In combination with the evolution of electrical and soft magnetic properties, the dependence of the GMI effect on the frequency and applied longitudinal field has been discussed by means of skin effect.
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