High-resolution electron microscopy study of strained epitaxial La0.7Sr0.3MnO3 thin films

O. I. Lebedev, G. Van Tendel, S. Amelinckx, Honglyoul Ju, Kannan M. Krishnan

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The microstructure of strained epitaxial La0.7Sr0.3MnO3(LSMO) films on a LaA103(001) substrate has been investigated by means of electron diffraction and high-resolution electron microscopy in cross-section and plan view. Courier transforms of the high-resolution images allow us to deduce the local lattice parameters at increasing distance from the interface. The evolution of stress in the film is studied as a function of film thickness and thermal treatment. It is found that, close to the interface, both the film and the substrate are elastically strained in the opposite sense such that the interface is perfectly coherent for thin films not exceeding a certain thickness (about 30-35 nm). In thicker films, inhomogeneities develop in the as-grown films. In thicker (about 120nm) films the stress is partially relieved after annealing by the formation of misfit dislocations with an edge character. In annealed thick films we also provide some evidence for the formation of coherent ‘precipitates’ that contribute to the relief of stress. It is suggested that part of the mismatch strain is accommodated by the isomorphous substitution of ions of a different size and/or a dilferent charge.

Original languageEnglish
Pages (from-to)673-691
Number of pages19
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume80
Issue number3
DOIs
Publication statusPublished - 2000 Jan 1

Fingerprint

High resolution electron microscopy
Epitaxial films
electron microscopy
Thin films
high resolution
thin films
Thick films
thick films
Substrates
Image resolution
Dislocations (crystals)
Electron diffraction
Lattice constants
Film thickness
Precipitates
Substitution reactions
Heat treatment
Annealing
Ions
precipitates

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

Cite this

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abstract = "The microstructure of strained epitaxial La0.7Sr0.3MnO3(LSMO) films on a LaA103(001) substrate has been investigated by means of electron diffraction and high-resolution electron microscopy in cross-section and plan view. Courier transforms of the high-resolution images allow us to deduce the local lattice parameters at increasing distance from the interface. The evolution of stress in the film is studied as a function of film thickness and thermal treatment. It is found that, close to the interface, both the film and the substrate are elastically strained in the opposite sense such that the interface is perfectly coherent for thin films not exceeding a certain thickness (about 30-35 nm). In thicker films, inhomogeneities develop in the as-grown films. In thicker (about 120nm) films the stress is partially relieved after annealing by the formation of misfit dislocations with an edge character. In annealed thick films we also provide some evidence for the formation of coherent ‘precipitates’ that contribute to the relief of stress. It is suggested that part of the mismatch strain is accommodated by the isomorphous substitution of ions of a different size and/or a dilferent charge.",
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High-resolution electron microscopy study of strained epitaxial La0.7Sr0.3MnO3 thin films. / Lebedev, O. I.; Van Tendel, G.; Amelinckx, S.; Ju, Honglyoul; Krishnan, Kannan M.

In: Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, Vol. 80, No. 3, 01.01.2000, p. 673-691.

Research output: Contribution to journalArticle

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AU - Ju, Honglyoul

AU - Krishnan, Kannan M.

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