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对Co68.15Fe4.35Si12.5B15非晶合金薄带进行低频脉冲磁场处理,Mssbauer谱分析及透射电镜(TEM)观察结果表明,样品发生了初始纳米晶化,晶化量与磁脉冲强度有关。采用巨磁阻抗(简称GMI)测量仪测量样品GMI,结果显示GMI与脉冲磁场强度HP呈非单调变化规律,HP为350kA·m-1时样品具有最大GMI,其值为263.5%。磁脉冲在样品内感生的横向各向异性对GMI效应产生影响,当外加直流磁场Hex等于感生磁各向异性场Hk时,GMI出现峰值。
The low-frequency pulsed magnetic field, the Mssbauer spectral analysis and the transmission electron microscopy (TEM) observation of the Co68.15Fe4.35Si12.5B15 amorphous alloy ribbons showed that the initial nanocrystallization occurred in the sample, and the amount of crystallization was related to the intensity of the magnetic pulse . GMI was measured by giant magnetoimpedance (GMI) measuring instrument. The results showed that the GMI and impulsive magnetic field strength HP showed a non-monotonous variation. When HP was 350kA · m-1, the sample had the highest GMI with a value of 263.5%. The transverse anisotropy induced by the magnetic pulse in the sample has an effect on the GMI effect. When the applied DC magnetic field Hex is equal to the induced magnetic anisotropy field Hk, the GMI peaks.