Giant magneto-impedance on glass-coated microwires with copper layer
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摘要: 首先利用高频感应加热熔融拉丝法制备了Fe73.0Cu1.0Nb2.0Si13.5B9.0玻璃包裹非晶丝;然后在氮气保护下480~650 ℃之间退火0.5 h; 最后利用化学镀方法在570 ℃退火的玻璃包裹丝上沉积了一层铜,构成复合结构丝.利用扫描电镜测量了材料的几何尺寸,研究了玻璃包裹丝退火前后及复合结构丝的巨磁阻抗效应.结果表明,材料的软磁特性改善提高了材料的磁阻抗比,铜层与磁性层之间的电磁相互作用也影响磁阻抗比.Abstract: The amorphous wires of nominal compositions Fe73.0Cu1.0Nb2.0Si13.5B9.0 were prepared by glass-coating melt-spinning method. Then, the wires were annealed at 480~650 ℃ for 30 min in nitrogen atmosphere. The composite wires with copper layer using electroless deposition were produced, a thin layer of copper deposited onto the microwires annealed at 570 ℃. The morphology of composite microwires was observed using SEM. The giant magnetoimpedance effect on the samples was investigated. The results show that soft magnetic properties of the specimen can improve its MI ratio. The electromagnetic interactions between the ferromagnetic core and the copper layer can also affect MI ratio.
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