Co^(2+)含量对钴铁氧体薄膜结构及磁性的影响  

Influence of Co^(2+) Content on the Microstructure and Magnetic Properties of Cobalt Ferrite Films

作　　者：李雁[1] 方庆清[1] 吕庆荣[1] 刘艳美[1] 尹平[1] 陈辉[1] 

机构地区：[1]安徽大学物理与材料科学学院安徽省信息材料与器件重点实验室教育部光电信息获取与控制重点实验室,安徽合肥230039

出　　处：《磁性材料及器件》2006年第6期30-33,共4页Journal of Magnetic Materials and Devices

基　　金：安徽省2005年度重点科研项目(05022045);安徽省教育厅青年教师基金项目(05010210);安徽省信息材料与器件重点实验室资助课题;教育部光电信息获取与控制重点实验室资助课题

摘　　要：采用溶胶-凝胶法在玻璃衬底上制备了钴铁氧体CoxFe3―xO4(x=0.2~0.8)薄膜。分别用振动样品磁强计及X射线衍射仪对样品的磁性和结构进行了测量与分析。结果表明,随Co2+含量增加,样品中的尖晶石相衍射峰逐渐增强,至x=0.8时为单一的尖晶石结构。高Co2+含量(x>0.7)样品的饱和磁化强度和矫顽力随退火温度的升高呈上升趋势,630℃退火Co0.8Fe2.2O4薄膜矫顽力达156kA/m。Co2+含量的增加还可使晶粒细化。当Co2+含量x=0.8时,可同时获得好的磁性能及小的晶粒。CoxFe3-xO4（x = 0.2-0.8） ferrite films were synthesized on glass substrates by sol-gel technique. The magnetic properties and microstructure were measured and analyzed by vibrating sample magnetometer and X-ray diffraction. The results reveals that the peaks of spinel phase becomes higher gradually with increasing amount of Co^2＋ ions, and then single spinel phase is formed at x= 0.8. The saturation magnetization and the cocrcivity of samples with x 〉0.7 increase with increasing annealing temperature. The Co0.8Fe2.2O4 films annealed at 630℃ has the coercivity value of 156kA/m. The grain becomes refined with increasing amount of Co^2＋ ions. For Co^2＋ ions content x=-0.8, preferable magnetic properties and small grain sizes are obtained.

关 键 词：钴铁氧体薄膜 溶胶-凝胶法 晶粒细化 磁胜 结构 

分 类 号：TM277.1[一般工业技术—材料科学与工程] O484.43[电气工程—电工理论与新技术]