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采用溶胶-凝胶旋涂法在经表面氧化的Si(100)基片上制备了Co0.8Fe2.2O4/Si O2纳米复合薄膜。利用X射线衍射仪、扫描电子显微镜和振动样品磁强计对Co0.8Fe2.2O4/Si O2纳米复合薄膜的结构、形貌和磁性能进行分析,研究了热处理温度对复合薄膜结构和磁性能的影响。结果表明:热处理温度高于750℃时复合薄膜中Co0.8Fe2.2O4呈现尖晶石结构;当热处理温度从750℃升高到1 100℃,复合薄膜中Co0.8Fe2.2O4的晶粒尺寸从6 nm增大到34 nm,晶胞常数从0.836 9 nm增大到0.839 5 nm。样品的矫顽力随热处理温度的升高先增大后减小,经1 000℃热处理样品的矫顽力达到298.3 k A/m。
The Co0.8Fe2.2O4 / Si O2 nanocomposite films were prepared by sol-gel spin-coating on surface-oxidized Si (100) substrates. The structure, morphology and magnetic properties of Co0.8Fe2.2O4 / Si O2 nanocomposite films were analyzed by X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. The effects of heat treatment temperature on the structure and magnetic properties of the composite films influences. The results show that Co0.8Fe2.2O4 in the composite film shows spinel structure when the temperature is higher than 750 ℃. When the heat treatment temperature is increased from 750 ℃ to 1100 ℃, the grain size of Co0.8Fe2.2O4 in the composite film changes from 6 nm increased to 34 nm, unit cell constants increased from 0.836 9 nm to 0.839 5 nm. The coercive force of the sample first increases and then decreases with the increase of the heat treatment temperature. The coercive force of the sample after heat treatment at 1 000 ℃ reaches 298.3 kA / m.