Correlation of magnetoelectric coupling in multiferroic BaTiO3-BiFeO3 superlattices with oxygen vacancies and antiphase octahedral rotations

Multiferroic (BaTiO3-BiFeO3) × 15 multilayer heterostructures show high magnetoelectric (ME) coefficients αME up to 24 V/cm·Oe at 300 K. This value is much higher than that of a single-phase BiFeO3 reference film (αME = 4.2 V/cm·Oe). We found clear correlation of ME coefficients with increasing oxyg...

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Bibliographic Details
Published in:Applied physics letters 2015-01, Vol.106 (1)
Main Authors: Lorenz, Michael, Wagner, Gerald, Lazenka, Vera, Schwinkendorf, Peter, Modarresi, Hiwa, Van Bael, Margriet J., Vantomme, André, Temst, Kristiaan, Oeckler, Oliver, Grundmann, Marius
Format: Article
Language:English
Subjects:
Applied physics
Barium titanates
Bismuth ferrite
Correlation
Coupling
Electron diffraction
Electrons
Heterostructures
Multiferroic materials
Multilayers
Oxygen
Partial pressure
Scanning electron microscopy
Scanning transmission electron microscopy
Superlattices
Transmission electron microscopy
Vacancies
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Summary:Multiferroic (BaTiO3-BiFeO3) × 15 multilayer heterostructures show high magnetoelectric (ME) coefficients αME up to 24 V/cm·Oe at 300 K. This value is much higher than that of a single-phase BiFeO3 reference film (αME = 4.2 V/cm·Oe). We found clear correlation of ME coefficients with increasing oxygen partial pressure during growth. ME coupling is highest for lower density of oxygen vacancy-related defects. Detailed scanning transmission electron microscopy and selected area electron diffraction microstructural investigations at 300 K revealed antiphase rotations of the oxygen octahedra in the BaTiO3 single layers, which are an additional correlated defect structure of the multilayers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4905343