退火时间对纳米CoFe_2O_4/SiO_2复合薄膜结构和磁性的影响  

Effect of Annealing Time on the Structure and Magnetic Properties of CoFe_2O_4/SiO_2 Nanocomposite Films

作　　者：刘宇[1] 沈伟霞[1] 刘梅[1] 李海波[1] 

机构地区：[1]吉林师范大学凝聚态物理与材料科学研究所,吉林四平136000

出　　处：《吉林师范大学学报（自然科学版）》2011年第1期40-42,共3页Journal of Jilin Normal University:Natural Science Edition

基　　金：吉林省科技发展计划项目(20090144)

摘　　要：利用溶胶-凝胶旋涂法制备了纳米CoFe2O4/SiO2复合薄膜.利用X射线衍射仪、原子力显微镜、振动样品磁强计对样品的结构和磁性进行了研究.结果表明,随着退火时间的延长,样品中CoFe2O4的晶粒尺寸和晶格常数变大.随着晶粒尺寸的增加,样品的矫顽力变大,当退火温度为3 h时,样品垂直和平行膜面的矫顽力分别为246 kA·m-1和198 kA·m-1,样品具有较明显的垂直磁各向异性.CoFe2O4/SiO2 nanocomposite films were prepared by sol-gel spin coating process.The structure,morphology and magnetic properties of the films have been studied through X-ray diffractometer（XRD）,atomic force microscope（AFM） and vibrating sample magnetometer（VSM）.The results show that the grain size and lattice constant of CoFe2O4 increases with extension of annealing time.The coercivity increases with the increase of the grain size.The film possesses perpendicular magnetic anisotropy with out-of-plane coercivity of 246 kA·m-1 and in-plane coercivity of 198 kA·m-1 when the annealing time is 3 h.

关 键 词：溶胶-凝胶法 钴铁氧体 纳米复合薄膜 结构 磁性 

分 类 号：O482.5[理学—固体物理]