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La0.8Ca0.2MnO3/SrTiO3薄膜厚度对其结构及磁学性能的影响

张红娣 安玉凯 麦振洪 高 炬 胡凤霞 王 勇 贾全杰

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La0.8Ca0.2MnO3/SrTiO3薄膜厚度对其结构及磁学性能的影响

张红娣, 安玉凯, 麦振洪, 高 炬, 胡凤霞, 王 勇, 贾全杰

Thickness effect on structure and magnetic properties of La0.8Ca0.2MnO3/SrTiO3 films

Zhang Hong-Di, An Yu-Kai, Mai Zhen-Hong, Gao Ju, Hu Feng-Xia, Wang Yong, Jia Quan-Jie
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  • 采用多种X射线衍射技术和磁电阻测量技术研究了不同厚度的La0.8Ca0.2MnO3/SrTiO3 (LCMO/STO)薄膜的应变状态及其对磁电阻性能的影响.结果表明,在STO(001)单晶衬底上生长的LCMO薄膜沿[00l]取向生长.LCMO薄膜具有伪立方钙钛矿结构,随着薄膜厚度的增加,面内晶格参数增加,垂直于面内的晶格参数减小,晶格参数a和b相近,略小于c.LC
    The thickness dependence of strain and magnetic properties of La0.8Ca0.2MnO3 (LCMO) thin films grown on SrTiO3 (STO) substrates were investigated by X-ray diffraction techniques and magnetic measurements. The results show that all the LCMO films are well oriented in the (00l) direction on the (001) STO substrate. The LCMO thin films have a pseudo-cubic structure. With the film thickness increasing, the in-plane lattice parameters decrease while the out-of-plane lattice parameter increases. The lattice parameter a is close to b, but a little smaller than c. The in-plane strain in the film is tensile due to the lattice mismatch between the LCMO film and STO substrate, whereas that out-of-plane is compressive. The LCMO films have a slightly perceptible mosaic structure along the qz direction, and there exists an angular deviation of about 0.1° between [001]LCMO and [001]STO. The physical properties of the films strongly depend on the film thickness. With the increase of the film thickness the TMI is enhanced, and the MR is weakened.
    • 基金项目: 国家自然科学基金(批准号:10274096和10574159)和Research Grants Council (RGC) of Hong Kong (批准号:HKU7025/06P)资助的课题.
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出版历程
  • 收稿日期:  2006-09-18
  • 修回日期:  2007-02-28
  • 刊出日期:  2007-09-20

La0.8Ca0.2MnO3/SrTiO3薄膜厚度对其结构及磁学性能的影响

  • 1. (1)香港大学物理系,香港; (2)中国科学院高能物理研究所,北京 100049; (3)中国科学院物理研究所国家凝聚态物理实验室,北京 100080
    基金项目: 国家自然科学基金(批准号:10274096和10574159)和Research Grants Council (RGC) of Hong Kong (批准号:HKU7025/06P)资助的课题.

摘要: 采用多种X射线衍射技术和磁电阻测量技术研究了不同厚度的La0.8Ca0.2MnO3/SrTiO3 (LCMO/STO)薄膜的应变状态及其对磁电阻性能的影响.结果表明,在STO(001)单晶衬底上生长的LCMO薄膜沿[00l]取向生长.LCMO薄膜具有伪立方钙钛矿结构,随着薄膜厚度的增加,面内晶格参数增加,垂直于面内的晶格参数减小,晶格参数a和b相近,略小于c.LC

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