非对称界面耦合对LaCoO_(3)/LaMnO_(3)双层膜性能调控研究  

Influence of Asymmetric Interface Coupling on Properties of LaCoO_(3)/LaMnO_(3) Bilayers

作　　者：谢长征 张国伟 余昌永 Xie Changzheng;Zhang Guowei;Yu Changyong(Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province,School of Physics and Materials Engineering,Hefei Normal University,Hefei 230601,China)

机构地区：[1]合肥师范学院物理与材料工程学院光电探测科学与技术安徽高校联合重点实验室,安徽合肥230601

出　　处：《稀有金属材料与工程》2021年第9期3039-3042,共4页Rare Metal Materials and Engineering

基　　金：Supported by Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province (2020GDTC02);Hefei Normal University High-Level Talents in 2020 (2020rcjj09)

摘　　要：通过高分子辅助溶胶凝胶自旋涂沉积法在(100)取向的SrTiO_(3)衬底上制备出LaCoO_(3)/LaMnO_(3)双层膜。在LaMnO_(3)表面生长一层LaCoO_(3)膜后,由于二者结构对称性差异,最终会在膜层界面处形成非对称界面耦合。由于非对称耦合作用,双层膜的铁磁转变温度从单层LaMnO_(3)的262 K下降为200 K。此外,由于界面处Mn-O-Co的双交换作用,与单层LaMnO_(3)薄膜的矫顽场相比,双层膜的矫顽场增大了约500%。研究结果表明,不同结构和性质的薄膜重组为多层膜的基础研究和高性能功能材料的应用提供了一种新的结构设计途径。The LaCoO_(3)/LaMnO_(3) bilayers epitaxial film grown on(100)SrTiO_(3) substrates were obtained by a simple polymer assisted sol-gel deposition method.Growing a LaCoO_(3) layer on the top of LaMnO_(3) leads to the asymmetric interface coupling at the interface layer due to their difference in strucural symmetry,and reduces the ferromagnetic transition temperature caused by the asymmetric interface coupling effect from 262 K to 200 K.In addition,compared with the coercive field of isolated LaMnO_(3) film,the coercive field observed in the bilayers is increased by~500%due to a strong ferromagnetic Mn-O-Co double exchange interaction at the interface.The results demonstrate that the recombination of multilayer films with different properties provides a new way to design functional materials for fundamental studies or demanding applications.

关 键 词：钙钛矿型双层膜 铁磁转变 矫顽场 界面耦合作用 

分 类 号：TB383.2[一般工业技术—材料科学与工程]