玻璃包覆层对钴基非晶丝巨磁阻抗效应的影响

分别用机械法和HF酸化学腐蚀方法去除金属芯丝直径为13μm、总直径为47μm的钴基Co68.15Fe4.35Nb1Si11.5B15.0非晶态玻璃包覆丝的玻璃包覆层,发现HF酸腐蚀去除玻璃层比机械法处理过的非晶丝的巨磁阻抗磁场灵敏度要高,HF酸剥离的非晶裸丝的巨磁阻抗最大磁场灵敏度可达ξ=105.02%/(79.6A/m)。HF酸去除玻璃包覆层的微细丝的阻抗效应要比有玻璃包覆层的丝在更低的外部磁场作用下达到巨磁阻抗比的最大值,在频率为f=4.07MHz、磁场强度为Hdc=176A/m处,非晶裸丝的磁阻抗效应达到最大值113.6%,其巨磁阻抗效应的磁场灵敏度ξ=42.9%/(79.6A/m)。

Effect of glass-coating layer on giant magneto-impedance(GMI) of Co-based amorphous microwire

Glass-coating layer of Co-based glass-coated amorphous microwire Co68.15Fe4.35Nb1Si11.5B15.0 with total diameter 47μm and metallic core diameter 13μm was removed by mechanical method and HF chemical corrosion,respectively.It is found that the maximum magnetic sensitivity of GMI for microwire with glass-coating layer removed by HF chemical corrosion is higher than that by mechanical mehod,and the former can reach ξ =105.02%/Oe.Maximum giant magnetoimpedance ratio can be reached at lower applied magnetic field for microwire without glass-coated layer than that with glass-coated layer.Amorphous microwire without glass layer The maxmum giant magnetoimpedance of 113.6% and magnetic sensitivity of 42.9%/Oe are obtained at frequency 4.07MHz and magnetic field Hdc=2.2Oe.