论文部分内容阅读
采用溶胶-凝胶旋涂法制备纳米Co0.8Mg0.2Fe2O4/SiO2复合薄膜。用X射线衍射仪、原子力显微镜及振动样品磁强计分析复合薄膜的结构、表面形貌和磁性,研究退火温度对复合薄膜结构和磁性的影响。结果表明:经800℃退火处理的样品中已形成Co0.8Mg0.2Fe2O4晶相;随着退火温度的提高,Co0.8Mg0.2Fe2O4晶粒尺寸变大,晶格常数减小;随着Co0.8Mg0.2Fe2O4晶粒尺寸的增大,样品的磁化强度和剩磁比变大,矫顽力先增大后减小,经1 100℃退火处理样品的垂直膜面矫顽力达到296.1 kA/m;样品存在较明显的垂直磁各向异性。
Nanometer Co0.8Mg0.2Fe2O4 / SiO2 composite film was prepared by sol-gel spin coating. The structure, surface morphology and magnetic properties of the composite films were analyzed by X-ray diffraction, atomic force microscopy and vibrating sample magnetometer. The effects of annealing temperature on the structure and magnetic properties of the composite films were investigated. The results show that the crystal structure of Co0.8Mg0.2Fe2O4 has been formed in the sample annealed at 800 ℃. With the increase of annealing temperature, the grain size of Co0.8Mg0.2Fe2O4 increases and the lattice constant decreases. With the increase of annealing temperature, .2 The grain size of Fe2O4 increases, the magnetization and remanence ratio become larger and the coercive force first increases and then decreases. The perpendicular coercive force of the sample annealed at 1 100 ℃ reaches 296.1 kA / m. The sample has obvious perpendicular magnetic anisotropy.