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Composition and Growth-Temperature Effect on the Microstructure of Epitaxial La1−x Srx MnO3 (x = 0, 0.2) Thin Films on (001) LaAlO3

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Abstract

La0.8Sr0.2MnO3 (LSMO) and LaMnO3 (LMO) thin films epitaxially grown on (001) LaAlO3 substrate at 700 and 800°C were studied using cross-section and plan-view transmission electron microscopy. In both LSMO and LMO films deposited at 700°C, a two-layered structure was observed: a continuous cubic perovskite layer epitaxially grown on the substrate followed by epitaxially grown orthorhombic column nanostructures. The orthogonal nano columns in LSMO were very well defined with a narrow size distribution. The LMO films exhibited a somewhat distorted orthogonal shape for the nanostructured columns and a wider size distribution. LSMO and LMO epitaxial films deposited at 800°C consisted of only a continuous single layer of cubic perovskite. These results reveal that formation of epitaxial column nanostructures in the La1-xSrxMnO3 thin films strongly depends on the growth temperature. Sr substitution on La sites in La1-xSrxMnO3 can improve uniformity of column size distribution and perfection of the orthogonal shape of nano columns.

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Authors and Affiliations

  1. Materials Science and Engineering Program, Mechanical Engineering Department, Louisiana State University, Baton Rouge, Louisiana, 70803, USA

    J. C. Jiang & E. I. Meletis

  2. Materials Chemistry Division, Indira Gandhi Centre For Atomic Research, Kalpakkam, 603 102, India

    K. I. Gnanasekar

Authors
  1. J. C. Jiang
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  2. E. I. Meletis
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  3. K. I. Gnanasekar
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Correspondence to J. C. Jiang.

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Jiang, J.C., Meletis, E.I. & Gnanasekar, K.I. Composition and Growth-Temperature Effect on the Microstructure of Epitaxial La1−x Srx MnO3 (x = 0, 0.2) Thin Films on (001) LaAlO3. Journal of Materials Research 18, 2556–2561 (2003). https://doi.org/10.1557/JMR.2003.0358

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  • DOI: https://doi.org/10.1557/JMR.2003.0358

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