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Title: Nanoscale monoclinic domains in epitaxial SrRuO{sub 3} thin films deposited by pulsed laser deposition

In this paper, we analyze the structural distortions observed by transmission electron microscopy in thin epitaxial SrRuO{sub 3} layers used as bottom electrodes in multiferroic coatings onto SrTiO{sub 3} substrates for future multiferroic devices. Regardless of the nature and architecture of the multilayer oxides deposited on the top of the SrRuO{sub 3} thin films, selected area electron diffraction patterns systematically revealed the presence of faint diffraction spots appearing in forbidden positions for the SrRuO{sub 3} orthorhombic structure. High-resolution transmission electron microscopy (HRTEM) combined with Geometric Phase Analysis (GPA) evidenced the origin of these forbidden diffraction spots in the presence of structurally disordered nanometric domains in the SrRuO{sub 3} bottom layers, resulting from a strain-driven phase transformation. The local high compressive strain (−4% ÷ −5%) measured by GPA in the HRTEM images induces a local orthorhombic to monoclinic phase transition by a cooperative rotation of the RuO{sub 6} octahedra. A further confirmation of the origin of the forbidden diffraction spots comes from the simulated diffraction patterns obtained from a monoclinic disordered SrRuO{sub 3} structure.
Authors:
; ; ; ;  [1]
  1. National Institute of Materials Physics, Atomistilor105 bis, 077125 Magurele (Romania)
Publication Date:
OSTI Identifier:
22308722
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COATINGS; ELECTRODES; ELECTRON DIFFRACTION; ENERGY BEAM DEPOSITION; EPITAXY; LASER RADIATION; LAYERS; MONOCLINIC LATTICES; NANOSTRUCTURES; ORTHORHOMBIC LATTICES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PRESSURE RANGE GIGA PA; RUTHENIUM COMPOUNDS; SIMULATION; STRONTIUM COMPOUNDS; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY