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Surface stability of epitaxial La0.7Sr0.3MnO3 thin films on (111)-oriented SrTiO3

Abstract

We report on the stability of the La0.7Sr0.3MnO3 thin film surface when deposited on (111)-oriented SrTiO3. For ultrathin La0.7Sr0.3MnO3 films, an initial 3-dimensional morphology is observed, which becomes 2-dimensional with increasing film thickness. For even thicker samples, we show that the surface morphology evolves from 2-dimensional to 3-dimensional and that this observation is consistent with an Asaro-Tiller-Grinfeld instability, which can be controlled by the deposition temperature. This allows for synthesis of films with step-and-terrace surfaces over a wide range of thicknesses. Structural characterization by x-ray diffraction and transmission electron microscopy shows that the films are strained to the SrTiO3 substrate and reveals the presence of an elongated out-of-plane lattice parameter at the interface with SrTiO3.

Category

Academic article

Language

English

Author(s)

  • Ingrid Hallsteinsen
  • Jos Emiel Boschker
  • Magnus Kristofer Nord
  • S Lee
  • M Rzchowski
  • Per Erik Vullum
  • Jostein Grepstad
  • Randi Holmestad
  • CB Eom
  • Thomas Tybell

Affiliation

  • Norwegian University of Science and Technology
  • University of Wisconsin-Madison
  • SINTEF Industry / Materials and Nanotechnology

Year

2013

Published in

Journal of Applied Physics

ISSN

0021-8979

Publisher

American Institute of Physics (AIP)

Volume

113

Issue

18

View this publication at Cristin