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Defect and Interfacial Structure of Heteroepitaxial Fe3O4/BaTiO3 Bilayers

Published online by Cambridge University Press:  09 April 2010

Sujing Xie ,
George E. Sterbinsky ,
Bruce W. Wessels  and
Vinayak P. Dravid
Sujing Xie*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
George E. Sterbinsky
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
Bruce W. Wessels
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
Vinayak P. Dravid
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
*
Corresponding author. E-mail: [email protected]
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Abstract

The defect and interfacial structure in a Fe3O4/BaTiO3 heteroepitaxial bilayer was investigated by scanning transmission electron microscopy. The results show that the Fe3O4 film grew epitaxially on BaTiO3. The orientation relationship between Fe3O4, BaTiO3 and MgO is [100]Fe3O4//[100]BaTi3O//[100]MgO and (010)Fe3O4//(010)BaTiO3//(010)MgO. An initial interfacial nucleation layer was formed that partially accommodated the lattice mismatch strain between BaTiO3 and MgO. This investigation indicates that the formation of this buffer layer provides a high-quality BaTiO3 surface for subsequent Fe3O4 growth, resulting in a semicoherent interface. The Fe3O4 surface is nearly atomically abrupt (roughness Rrms = 0.78 nm). The Fe3O4 film exhibits magnetic domains with a diameter in the range of 0.4–2 μm.

Keywords

transmission electron microscopyinterfacial structuredislocationferromagnetismferroelectricity
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 16 , Issue 3 , June 2010 , pp. 300 - 305
Copyright
Copyright © Microscopy Society of America 2010

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