1. Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films.
- Author
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Lorenz, Michael, Wagner, Gerald, Lazenka, Vera, Schwinkendorf, Peter, Bonholzer, Michael, Van Bael, Margriet J., Vantomme, André, Temst, Kristiaan, Oeckler, Oliver, and Grundmann, Marius
- Subjects
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BARIUM titanate , *MAGNETOELECTRIC effect , *BISMUTH iron oxide synthesis , *BISMUTH iron oxide , *MAGNETIC properties , *MULTIFERROIC materials , *PULSED laser deposition - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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