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Materials (Basel). 2016 Jan 13;9(1). pii: E44. doi: 10.3390/ma9010044.

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

Author information

1
Institut für Experimentelle Physik II, Universität Leipzig, Leipzig D-04103, Germany. mlorenz@physik.uni-leipzig.de.
2
Institut für Mineralogie, Kristallographie und Materialwissenschaft, Universität Leipzig, Leipzig D-04103, Germany. wagner@chemie.uni-leipzig.de.
3
Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven B-3001, Belgium. vera.lazenka@fys.kuleuven.be.
4
Institut für Experimentelle Physik II, Universität Leipzig, Leipzig D-04103, Germany. schwinkendorf@physik.uni-leipzig.de.
5
Institut für Experimentelle Physik II, Universität Leipzig, Leipzig D-04103, Germany. bonholzer@physik.uni-leipzig.de.
6
Laboratorium voor Vaste-Stoffysica en Magnetisme, KU Leuven, Leuven B-3001, Belgium. margriet.vanbael@fys.kuleuven.be.
7
Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven B-3001, Belgium. andre.vantomme@fys.kuleuven.be.
8
Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven B-3001, Belgium. kristiaan.temst@fys.kuleuven.be.
9
Institut für Mineralogie, Kristallographie und Materialwissenschaft, Universität Leipzig, Leipzig D-04103, Germany. oliver.oeckler@uni-leipzig.de.
10
Institut für Experimentelle Physik II, Universität Leipzig, Leipzig D-04103, Germany. grundmann@physik.uni-leipzig.de.

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.

KEYWORDS:

magnetoelectric coupling; magnetoelectric voltage coefficient; multiferroic composites; oxide thin films; oxygen vacancy superstructure; pulsed laser deposition

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