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采用溶胶-凝胶旋涂法制备了纳米Co1-xMgxFe2O4/SiO2(x=0,0.2,0.4,0.6,0.8)复合薄膜。利用XRD、SEM、原子力显微镜、振动样品磁强计对薄膜的结构、形貌和磁性进行了分析,研究了Mg2+含量对样品结构和磁性的影响。结果表明,样品中Co1-xMgxFe2O4具有尖晶石结构,晶粒尺寸在38～46nm之间。随着Mg2+含量的增加,Co1-xMgxFe2O4的晶格常数减小,样品的饱和磁化强度减小,矫顽力先增大后减小。样品Co0.4Mg0.6Fe2O4/SiO2垂直和平行膜面的矫顽力分别为350.7kA.m-1和279.4kA.m-1,剩磁比分别为67.2%和53.9%,Co1-xMgxFe2O4/SiO2复合薄膜具有较明显的垂直磁各向异性。
Nanometer Co1-xMgxFe2O4 / SiO2 (x = 0,0.2,0.4,0.6,0.8) composite films were prepared by sol-gel spin coating. The structure, morphology and magnetism of the films were analyzed by XRD, SEM, atomic force microscope and vibrating sample magnetometer. The effects of Mg2 + content on the structure and magnetic properties of the samples were investigated. The results show that Co1-xMgxFe2O4 has a spinel structure with a grain size of 38 ~ 46nm. With the increase of Mg2 + content, the lattice constant of Co1-xMgxFe2O4 decreases, the saturation magnetization decreases and the coercive force first increases and then decreases. The coercivities of the samples Co0.4Mg0.6Fe2O4 / SiO2 perpendicular and parallel to the membrane surface were 350.7kA.m-1 and 279.4kA.m-1, respectively. The remanence ratios were 67.2% and 53.9% respectively. The Co1-xMgxFe2O4 / SiO2 composites The film has obvious perpendicular magnetic anisotropy.