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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Veröffentlicht in:	Applied physics letters 2015-01, Vol.106 (1)
Hauptverfasser:	Lorenz, Michael, Wagner, Gerald, Lazenka, Vera, Schwinkendorf, Peter, Modarresi, Hiwa, Van Bael, Margriet J., Vantomme, André, Temst, Kristiaan, Oeckler, Oliver, Grundmann, Marius
Format:	Artikel
Sprache:	eng
Schlagworte:	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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Zusammenfassung:	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