退火对FeCo基磁环巨磁阻抗效应的影响

Influence of annealing on giant magneto-impedance effect of FeCo-based alloy magnetic loop

采用铜模吸铸法制备了Fe36Co36Nb4Si4.8B19.2非晶合金管,切成薄环后,用系列温度对其进行退火处理。然后用X射线衍射仪测试了样品的相组成,用HP4294A阻抗分析仪测量了样品的磁阻抗。分析了退火温度对FeCo基磁环环向驱动巨磁阻抗效应的影响,发现退火可以显著改善FeCo基磁环样品的环向巨磁阻抗效应,540℃退火样品的巨磁阻抗效应达到最佳,其阻抗比达286%。

A series of Fe36Co36Nb4Si4.8B19.2 amorphous alloy tubes were prepared by water-cooled copper mold method.The tubes were cut into thin loops,and were annealed at different temperatures.The phase structure of samples was tested by using X-ray diffractometer.Magneto-impedance of samples was measured by HP4294A impedance analyzer.The influence of annealing temperature on the GMI effect of FeCo-based alloy magnetic loop was analysed.The experiments showed that the GMI effect of FeCo-based alloy magnetic loop was enhanced by annealing,when magnetic loop of FeCo-based alloy was annealed at 540℃,the best GMI ratio of 286% can be obtained.