Materials | |
Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films | |
Michael Lorenz3  Gerald Wagner1  Vera Lazenka4  Peter Schwinkendorf3  Michael Bonholzer3  Margriet J. Van Bael2  André Vantomme4  Kristiaan Temst4  Oliver Oeckler1  Marius Grundmann3  | |
[1] Institut für Mineralogie, Kristallographie und Materialwissenschaft, Universität Leipzig, Leipzig D-04103, Germany;Laboratorium voor Vaste-Stoffysica en Magnetisme, KU Leuven, Leuven B-3001, Belgium;Institut für Experimentelle Physik II, Universität Leipzig, Leipzig D-04103, Germany;Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven B-3001, Belgium; | |
关键词: oxide thin films; multiferroic composites; magnetoelectric coupling; magnetoelectric voltage coefficient; oxygen vacancy superstructure; pulsed laser deposition; | |
DOI : 10.3390/ma9010044 | |
来源: mdpi | |
【 摘 要 】
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.
【 授权许可】
CC BY
© 2016 by the authors; licensee MDPI, Basel, Switzerland.
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