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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

Published online by Cambridge University Press:  31 January 2011

J.C. Jiang ,
E.I. Meletis  and
K.I. Gnanasekar
J.C. Jiang*
Affiliation:
Materials Science and Engineering Program, Mechanical Engineering Department, Louisiana State University, Baton Rouge, Louisiana 70803
E.I. Meletis
Affiliation:
Materials Science and Engineering Program, Mechanical Engineering Department, Louisiana State University, Baton Rouge, Louisiana 70803
K.I. Gnanasekar
Affiliation:
Materials Chemistry Division, Indira Gandhi Centre For Atomic Research, Kalpakkam - 603 102, India
*
a)Address all correspondence to this author. e-mail: Jiang@me.lsu.edu
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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.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2556 - 2561
Copyright
Copyright © Materials Research Society 2003

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