Influence of Joule annealing on GMI effect for Co-based amorphous microwires(Chinese)
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摘要: 对直径为40 μm,长为5 cm的褪膜玻璃包裹钴基（Co69.20Fe4.16 Si12.35B10.77 Cr3.42 Mo0.1）非晶丝进行电流退火和电流应力退火，研究了退火对巨磁阻抗效应的影响.结果发现，随着退火电流密度和外加应力的增大，丝的磁阻抗变化对外加磁场的敏感度先增大后减小，在20 A/mm2和90 MPa的退火条件下，灵敏度最高，可达1%/( A·m-1).以上述条件退火，敏感度最高可达19%/( A·m-1).Abstract: Co-based（Co69.20Fe4.16 Si12.35B10.77 Cr3.42 Mo0.1） amorphous microwires with 40 μm in diameter and 5 cm in length，were annealed by Joule current and by stress Joule annealing. The relationship between giant magneto-impedance effect and the density of annealing current and the intensity of stress was investigated. The results showde that the GMI ratios firstly increase then decrease with the increase of the density of current and the intensity of the stress. The maximum of sensitivity of GMI ratios to applied field is 1%/( A·m-1) at 20 A/mm2 and 90 MPa.The sensitivity of wires which were annealed with these conditions can be 19%/(A·m-1).
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