Microstructure of epitaxial La₀.₇Ca₀.₃MnO₃ thin films grown on LaAlO₃ and SrTiO₃

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Title: Microstructure of epitaxial La₀.₇Ca₀.₃MnO₃ thin films grown on LaAlO₃ and SrTiO₃
Author: Lu, C. J. ; Wang, Z. L. (Zhong Lin) ; Kwon, C. ; Jia, Q. X.
Abstract: Epitaxial La₀.₇Ca₀.₃MnO₃ (LCMO) thin films of a thickness ~170 nm were grown on (001) LaAlO₃ (LAO) and (001) SrTiO₃ (STO) substrates by pulsed laser deposition. Transmission electron microscopy and associated techniques have been applied to investigate the microstructures introduced by lattice mismatch that are responsible for the observed differences in properties between these two films. Numerous secondary phase rods were observed in both films. For the LCMO/LAO film, Ca-deficient secondary-phase rods originated in the film after a thickness of about 25 nm and were found to be responsible for relieving in-plane compressive stress during the island growth. In the case of STO substrate, however, almost all of secondary-phase rods initiated at the film–substrate interface. The lattice mismatch between LCMO and STO is relaxed into regions of good coherent fit separated by such secondary phases, possibly resulting from interfacial reaction. The two types of substrates lead to the formation of two different crystallographic domain structures in the LCMO films. The film on LAO exhibits an almost pure [110] out-of-plane texture with 90° domains in plane. In contrast, the film grown on STO consists of mixed domains of [001] and [110] orientations and is dominated by [001] texture.
Description: ©2000 American Institute of Physics. The electronic version of this article is the complete one and can be found online at: http://link.aip.org/link/?JAPIAU/88/4032/1 DOI:10.1063/1.1290741
Type: Article
URI: http://hdl.handle.net/1853/27293
ISSN: 0021-8979
Citation: Journal of Applied Physics, 88 (2000) 4032-4043
Date: 2000-10-01
Contributor: Chinese Academy of Sciences. Beijing Laboratory of Electron Microscopy
Chinese Academy of Sciences. Center for Condensed Matter Physics
California State University, Long Beach. Dept. of Physics and Astronomy
Los Alamos National Laboratory
Publisher: Georgia Institute of Technology
American Institute of Physics
Subject: Lanthanum oxides
Calcium oxides
Manganese oxides
Strontium titanates
Thin films
Transmission electron microscopy
Lanthanum compounds
Calcium compounds
Magnetic epitaxial layers
Pulsed laser deposition
Internal stresses
Crystal microstructure

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