FeSiB/Cu/FeSiB夹心薄膜巨磁阻抗效应研究

Investigation of Giant Magnetoimpedance in Sandwiched FeSiB/Cu/FeSiB Films

研究了非晶FeSiB/Cu/FeSiB夹心薄膜在100kHz～40MHz范围内的巨磁阻抗效应。当磁场和交流电流沿薄膜的纵向时,磁阻抗比随磁场的增大而增强,在磁场约1600A/m下达到最大值,然后随磁场的增大而下降到负值。在频率3MHz、磁场1600A/m时磁阻抗比达到最大值17.2%。磁阻抗比的最大值及负的磁阻抗比与夹心薄膜中磁各向异性轴的取向有关。另外,当磁场施加在薄膜的横向时,薄膜表现出负的磁阻抗效应,在频率3MHz、磁场5600A/m时,磁阻抗比达-13.4%。

Giant magneto-impedance (GMI) effect has been studied in sandwiched FeSiB/Cu/FeSiB films. With magnetic field Ha and AC current applied along the longitudinal direction of the sample, the GMI ratio increases with the increase of Ha, reaches positive maximum value, and then decreases to negative values with further increase of magnetic field. The positive maximum GMI ratio is 17.2% for Ha=1600A/m and frequency of 3MHz. In addition, the films display large negative GMI ratio with magnetic field applied along the transverse and the value of the GMI ratio is about 13.4% for Ha=5600A/m and frequency of 3MHz.