钴基玻璃包裹丝软磁性能的优化

Optimization of soft magnetic property for Co-based glass-covered microwires

采用高频感应加热熔融快淬法制备钴基玻璃包裹丝,研究了包裹丝的直径和退火电流密度对于巨磁阻抗效应(Giant Magnetoimpedance,GMI)和磁场灵敏度的影响.结果显示,随着包裹丝直径的增大,GMI和磁场灵敏度先增大后减小,当包裹丝总直径为29μm时,软磁性能最好.用此直径的包裹丝进行不同电流密度的电流退火处理,发现当退火电流密度为120A/mm^2时,磁场灵敏度最高为602%/Oe(1 Oe=1000/(4π)A/m).

This paper studied the Giant Magnetoimpedance（GMI） and field sensitivity（ζ） of Co-based microwires with different diameters and under different annealing current densities, which was prepared by the Taylor-Ulitovsky method.The results showed that with the increase of diameters of the microwires the GMI andζboth increase first and then decrease.The best soft magnetic property is obtained for the microwires with 29μm in diameter.The highest field sensitivity （602%/Oe） is found under 120 A/mm^2 current annealing.