【作者】 刘龙平； 赵振杰； 王蕊丽； 阮建中； 杨燮龙；

【Author】 LIU Long-ping, ZHAO Zhen-jie, WANG Rui-li, RUAN Jian-zhong, YANG Xie-long (Department of Physics, Center of functional Nanomaterials & Devices, East China Normal University, Shanghai 200062, China)

【机构】 华东师范大学物理系纳米功能材料与器件应用研究中心；

【摘要】 采用高频感应加热熔融拉引法制备玻璃包裹Fe73.0Cu1.0Nb1.5V2.0Si13.5B9.0纳米晶丝,细丝直径D约为3-20 μm,玻璃层厚度d在1-2μm之间,其中玻璃层厚度占细丝总直径较小。研究结果发现,玻璃包襄Fe73.0Cu1.0Nb1.5V2.0Si13.5B9.0纳米晶细丝具有良好的高频巨磁阻抗效应,细丝磁阻抗的变化主要由电阻部分的变化决定,同时出现最大磁阻抗变化时对应的外磁场值Hm随频率的增加向高场方向移动。系统研究了不同条件细丝在趋肤效应开始明显时的起始频率f0变化情况,讨论了影响f0的各种可能因素。更多还原

【Abstract】 Amorphous Fe73.0Cu1.0Nb1.5V2.0Si13.5B9.0 microwires were prepared using glass-coating melt-spinning method, and nanocrystalline microwires were obtained after annealing the amorphous microwires at appropriate temperatures. These microwires are of 3-20 μm in diameter and covered by a glass insulation of l-2μm in thickness. Giant magneto-impedance (GMI) effect measurements were carried out for all of the microwires. It can be seen from the experimental results that the microwires have obvious GMI effect at high frequencies. The resistance part of the impedance makes the main contribution to GMI effect. The peak DC magnetic field value corresponding to the maximum MI ratio will increase with the increase of the frequency. The cut-off frequency, which the skin effect begin to be evident at this frequency, was also investigated under various conditions.更多还原