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Materials 2016, 9(1), 44; doi:10.3390/ma9010044

Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films

1
Institut für Experimentelle Physik II, Universität Leipzig, Leipzig D-04103, Germany
2
Institut für Mineralogie, Kristallographie und Materialwissenschaft, Universität Leipzig, Leipzig D-04103, Germany
3
Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven B-3001, Belgium
4
Laboratorium voor Vaste-Stoffysica en Magnetisme, KU Leuven, Leuven B-3001, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Jan Ingo Flege
Received: 30 October 2015 / Revised: 18 December 2015 / Accepted: 30 December 2015 / Published: 13 January 2016
(This article belongs to the Special Issue Epitaxial Materials 2015)
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Abstract

Epitaxial multiferroic BaTiO3-BiFeO3 composite thin films exhibit a correlation between the magnetoelectric (ME) voltage coefficient αME and the oxygen partial pressure during growth. The ME coefficient αME reaches high values up to 43 V/(cm·Oe) at 300 K and at 0.25 mbar oxygen growth pressure. The temperature dependence of αME of the composite films is opposite that of recently-reported BaTiO3-BiFeO3 superlattices, indicating that strain-mediated ME coupling alone cannot explain its origin. Probably, charge-mediated ME coupling may play a role in the composite films. Furthermore, the chemically-homogeneous composite films show an oxygen vacancy superstructure, which arises from vacancy ordering on the {111} planes of the pseudocubic BaTiO3-type structure. This work contributes to the understanding of magnetoelectric coupling as a complex and sensitive interplay of chemical, structural and geometrical issues of the BaTiO3-BiFeO3 composite system and, thus, paves the way to practical exploitation of magnetoelectric composites. View Full-Text
Keywords: oxide thin films; multiferroic composites; magnetoelectric coupling; magnetoelectric voltage coefficient; oxygen vacancy superstructure; pulsed laser deposition oxide thin films; multiferroic composites; magnetoelectric coupling; magnetoelectric voltage coefficient; oxygen vacancy superstructure; pulsed laser deposition
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MDPI and ACS Style

Lorenz, M.; Wagner, G.; Lazenka, V.; Schwinkendorf, P.; Bonholzer, M.; Van Bael, M.J.; Vantomme, A.; Temst, K.; Oeckler, O.; Grundmann, M. Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films. Materials 2016, 9, 44.

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