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Epitaxial thin films of multiferroic Bi2FeCrO6 with B-site cationic order

Published online by Cambridge University Press:  31 January 2011

Riad Nechache
Affiliation:
Institut National de la Recherche Scientifique (INRS)/Université du Québec INRS-Énergie, Matériaux & Télécommunications (INRS-EMT), Varennes (Montreal metropolitan area), Québec, J3X 1S2 CANADA
Louis-Philippe Carignan
Affiliation:
École Polytechnique de Montréal, Département de Génie Physique, Station. Centre-ville, Montréal, (Québec), H3C 6A7 (Canada)
Lina Gunawan
Affiliation:
Department of Materials Science and Engineering, Brockhouse Institute for Materials Research and Centre for Emerging Device Technologies, McMaster University, West Hamilton (Ontario), L8S 4M1 (Canada)
Catalin Harnagea
Affiliation:
Institut National de la Recherche Scientifique (INRS)/Université du Québec INRS-Énergie, Matériaux & Télécommunications (INRS-EMT), Varennes (Montreal metropolitan area), Québec, J3X 1S2 CANADA
Gianluigi A. Botton
Affiliation:
Department of Materials Science and Engineering, Brockhouse Institute for Materials Research and Centre for Emerging Device Technologies, McMaster University, West Hamilton (Ontario), L8S 4M1 (Canada)
David Ménard
Affiliation:
École Polytechnique de Montréal, Département de Génie Physique, Station. Centre-ville, Montréal, (Québec), H3C 6A7 (Canada)
Alain Pignolet*
Affiliation:
Institut National de la Recherche Scientifique (INRS)/Université du Québec INRS-Énergie, Matériaux & Télécommunications (INRS-EMT), Varennes (Montreal metropolitan area), Québec, J3X 1S2 CANADA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Epitaxial thin films of Bi2FeCrO6 (BFCO) have been synthesized by pulsed laser deposition on SrRuO3 on (100)- and (111)-oriented SrTiO3 substrates. Detailed x-ray diffraction and cross-section transmission electron microscopy analysis revealed a double perovskite crystal structure of the BFCO epitaxial films very similar to that of BiFeO3 along with a particularly noteworthy Fe3+/Cr3+ cation ordering along the [111] direction. The films contain no detectable magnetic iron oxide impurities and have the correct cationic average stoichiometry throughout their thickness. They however exhibit a slight modulation in the Fe and Cr compositions forming complementary stripe patterns, suggesting minor local excess or depletion of Fe and Cr. The epitaxial BFCO films exhibit good ferroelectric and piezoelectric properties, in addition to magnetic properties at room temperature, as well as an unexpected crystallographic orientation dependence of their room-temperature magnetic properties. Our results qualitatively confirm the predictions made using the ab initio calculations: the double perovskite structure of BFCO films exhibit a Fe3+/Cr3+ cation ordering and good multiferroic properties, along with the unpredicted existence of magnetic ordering at room temperature.

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Articles
Copyright
Copyright © Materials Research Society 2007

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