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Title: Two dimensional growth of ultrathin Fe films on BaTiO{sub 3} with sharp chemical interface

The Fe/BaTiO{sub 3} interface is a prototypical artificial multiferroic system displaying purely electronic magnetoelectric effects at room temperature. As magneto-electric coupling is essentially localized at the interface, the properties of the very first Fe layers in contact with BaTiO{sub 3} play a major role. In this paper, we investigate, by using X-ray photoemission spectroscopy and photoelectron diffraction, the in-situ growth, by molecular beam epitaxy, of ultrathin Fe films (∼7 monolayers) on a BaTiO{sub 3}/SrTiO{sub 3}(001) template. We found that growing the Fe films above room temperature (373 K) is essential in order to avoid island growth and obtain a continuous film. Post-annealing up to 473 K improves the film crystallinity but prevents chemical interdiffusion and roughening. Just an interfacial monolayer of oxidized iron is detected in these conditions, which appears as an unavoidable consequence of the Fe/BaTiO{sub 3} chemical interaction. Its active role in magnetoelectric coupling must be carefully taken into account to correlate theoretical predictions and experiments.
Authors:
; ; ;  [1] ;  [2]
  1. Dipartimento di Fisica, CNISM and LNESS, Politecnico di Milano, Via Anzani 42, 22100 Como (Italy)
  2. Institute of Solid State Physics, Key Laboratory of Materials Physics, Chinese Academy of Sciences, Hefei 230031 (China)
Publication Date:
OSTI Identifier:
22278086
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 6; 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; ANNEALING; BARIUM COMPOUNDS; COUPLING; CRYSTAL GROWTH; ELECTRICAL PROPERTIES; EMISSION SPECTROSCOPY; INTERFACES; IRON; MAGNETIC PROPERTIES; MOLECULAR BEAM EPITAXY; PHOTOEMISSION; STRONTIUM TITANATES; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; X-RAY SPECTROSCOPY