还原温度对纳米FeCo/Al_2O_3复合薄膜结构和磁性的影响  

Effects of reduction temperature on the structure and magnetic properties of FeCo/Al_2O_3 nanocomposite films

作　　者：刘梅[1] 沈维霞[1] 刘宇[1] 马丹丹[1] 李海波[1] 

机构地区：[1]吉林师范大学功能材料物理与化学教育部重点实验室,吉林四平136000

出　　处：《电子元件与材料》2011年第8期24-26,30,共4页Electronic Components And Materials

基　　金：吉林省青年基金科研资助项目(No.20090144)

摘　　要：采用溶胶–凝胶旋涂法和H2还原工艺制备了纳米FeCo/Al2O3复合薄膜。利用X射线衍射仪、扫描电子显微镜、原子力显微镜及振动样品磁强计研究了还原温度对薄膜结构、表面形貌和磁性的影响。结果表明,随着还原温度的升高,薄膜中FeCo的晶粒尺寸和晶格常数变大,薄膜的饱和磁化强度(Ms)也同时增大,其矫顽力(Hc)则先增大,后减小。薄膜Ms的变化与FeCo晶粒的尺寸和表面效应有关,Hc的变化则来源于FeCo的单畴结构并受磁各向异性影响。还原温度为900℃的薄膜表现出较好的软磁特性,其Ms及Hc分别为436.7 kA.m–1和34.6 kA.m–1。FeCo/Al2O3 nanocomposite films were prepared by the sol-gel spin-coating method and the H2 reduction technique.The effects of reduction temperature on the structure,thickness,surface morphology and magnetic properties of the films were investigated by X-ray diffractometer,scanning electron microscope,atomic force microscope and vibrating sample magnetometer.The results show that the grain size as well as the lattice parameters of FeCo crystal in the films and the saturation magnification（Ms） of the films increase with increasing reduction temperature,while the coercivity（Hc） of the films increases first and then decreases.Change in Ms of the films relates to the grain size and surface effect of FeCo grain,while variation in Hc of the films results from the single domain structure of FeCo and is affected by the magnetic anisotropy.The films reduced at 900 ℃ show typical soft magnetic properties with Ms = 436.7 kA？m–1 and Hc = 34.6 kA？m–1.

关 键 词：溶胶–凝胶旋涂法 FeCo/Al_2O_3 纳米复合薄膜 结构 磁性 

分 类 号：O482.5[理学—固体物理]