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La1-xCaxMnO3外延薄膜的制备、结构及磁电阻效应
引用本文:陈蕊,冯明,苟喜成,李海波.La1-xCaxMnO3外延薄膜的制备、结构及磁电阻效应[J].高等学校化学学报,2012,33(11):2385-2389.
作者姓名:陈蕊  冯明  苟喜成  李海波
作者单位:吉林师范大学功能材料物理与化学教育部重点实验室;吉林大学无机合成与制备化学国家重点实验室
基金项目:吉林省科技发展计划项目(批准号:20100179)资助
摘    要:采用溶胶-凝胶旋涂法在单晶LaAlO3 (100)基片上生长了La1-xCaxMnO3(x=0, 0.05, 0.1, 0.2)外延薄膜. 利用X射线衍射仪(XRD)、 原子力显微镜(AFM)、 聚焦离子束系统(FIB)、 X射线光电子能谱分析仪(XPS)、 振动样品磁强计(VSM)和磁性测量系统(MPMS)对样品的结构、 形貌、 价态、 居里温度和磁电阻效应进行了研究. 结果表明, 薄膜为立方钙钛矿结构, 具有明显的(100)外延生长取向和平整的表面. 在居里温度附近, 样品发生铁磁-顺磁转变. 随着Ca2+掺杂量的增加, 样品的居里温度升高, La0.8Ca0.2MnO3的居里温度为264 K. 随温度的变化, 样品发生了金属-绝缘体转变. 样品还具有较大的磁电阻效应, 在H=2.0 T, T=210 K时, La0.95Ca0.05MnO3的磁电阻达到80.9%.

关 键 词:La1-xCaxMnO3外延薄膜  溶胶-凝胶旋涂法  居里温度  巨磁电阻效应
收稿时间:2011-11-24

Preparation, Structure and Magnetoresistance Effect of La1-xCaxMnO3 Epitaxial Film
CHEN Rui,FENG Ming,GOU Xi-Cheng,LI Hai-Bo.Preparation, Structure and Magnetoresistance Effect of La1-xCaxMnO3 Epitaxial Film[J].Chemical Research In Chinese Universities,2012,33(11):2385-2389.
Authors:CHEN Rui  FENG Ming  GOU Xi-Cheng  LI Hai-Bo
Institution:1,2* (1.Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University,Siping 136000,China; 2.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University,Changchun 130012,China)
Abstract:La1-xCaxMnO3(x=0, 0.05, 0.1, 0.2) epitaxial films were grown on LaAlO3 (100) single-crystal substrate by sol-gel spin-coating method. The crystal structure, morphology, valence state, curie temperature and magnetoresistance effect of the films were investigated via X-ray diffractometer, atom force microscope, focused ion beam system, X-ray photoelectron spectrometer, vibrating sample magnetometer and superconduc-ting quantum interference device. The results show that the crystal structure of the film is cubic with high (h00)-oriented epitaxial direction and smooth surface. The maximum of Curie temperature is 264 K. Near the Curie temperature, the magnetic properties exhibit a transition from ferromagnetism to paramagnetism. The La0.95Ca0.05MnO3 film exhibit a maximum magnetoresistance ratio of 80.9% at 210 K and 2.0 T magnetic field.
Keywords:La1-xCaxMnO3 epitaxial film" target="_blank">1-xCaxMnO3 epitaxial film')" href="#">La1-xCaxMnO3 epitaxial film  Sol-gel spin-coating method  Curie temperature  Colossal Magnetoresistance(CMR) effect
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