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采用磁控共溅射法制备了Co含量介于6.4at%~16.4at%的Co-C纳米复合薄膜。形貌观察表明,Co纳米颗粒均匀分散在C基体中,相邻Co颗粒被C基体较好地分离,样品呈现典型的颗粒薄膜结构。Co颗粒平均尺寸随Co含量增加而增大。薄膜在低温下磁性较强,在室温下磁性较弱;磁化强度随Co含量增加显著提高。当温度为4.2K、磁场为90×79.6kA·m-1时,在Co含量为6.4at%、8.3at%和9.6at%的Co-C薄膜中分别观察到9.1%、4.3%和1.9%的负磁电阻,为碳基磁性颗粒薄膜获得优异磁输运性能提供可能。受微结构变化影响,样品磁电阻值随Co含量的增加而下降。
Co-C nanocomposite films with Co content ranging from 6.4 at% to 16.4 at% were prepared by magnetron sputtering. Morphology observation shows that the Co nanoparticles are uniformly dispersed in the C matrix, the adjacent Co particles are well separated by the C matrix, and the sample has a typical granular film structure. The average size of Co particles increases with increasing Co content. The films are highly magnetic at low temperature and weakly magnetic at room temperature. The magnetization increases with the increase of Co content. 9.1%, 4.3% and 1.9% were observed in the Co-C films with Co contents of 6.4 at%, 8.3 at% and 9.6 at% when the temperature was 4.2 K and the magnetic field was 90 × 79.6 kA · m -1. Of the negative magnetic resistance, for carbon-based magnetic particle film to obtain excellent magnetic transport properties possible. Affected by the microstructural changes, the value of the magnetoresistance decreased with the increase of Co content.