LaAlO_3顶层结构对LaAlO_3-BaTiO_3铁电超晶格薄膜性能的影响  

Effect of LaAlO_3 Cap Layer on Ferroelectric Properties of LaAlO_3-BaTiO_3 Superlattices

作　　者：刘云杰[1] 郝兰众[1] 李燕[2] 邓宏[2] 

机构地区：[1]中国石油大学(华东)物理科学与技术学院材料物理系,东营257061 [2]电子科技大学微电子与固体电子学院材料物理与化学系,成都610054

出　　处：《材料导报》2007年第4期155-156,共2页Materials Reports

基　　金：国家973基础研究基金资助项目(51310z);山东省自然科学基金资助项目(O2006A09)

摘　　要：X射线衍射技术分析发现,通过生长一层较厚的LaAlO3顶层结构,可以把LaAlO3-BaTiO3超晶格中界面处的应变有效地控制在薄膜中,从而增加超晶格薄膜的平均面外晶格常数c。电学性能测试证明LaAlO3顶层结构的存在极大地改善了超晶格薄膜的电学性能,使其剩余极化强度增加了40多倍。It＇s found that the out-plane lattice of the superlatices would be enlarged with the use of LaAlO3 cap layer by the analysis of X-ray diffraction. The lattice changes are attributed to the function of the restriction of strain at the interfaces by LaAlO3 cap layer. The measurement of electric properties reveals that LaAlO3 cap layer enhances the ferroelectric properties. The remnant polarization of LaAlO3-BaTiO3 superlattices with LaAlO3 cap layer is 40 times larger than that of the superlattices with no cap layer.

关 键 词：超晶格 应变 X射线衍射 剩余极化强度 

分 类 号：TB43[一般工业技术]