Defect and interfacial structure of heteroepitaxial Fe3O 4/BaTiO3 bilayers

Sujing Xie*, George E. Sterbinsky, Bruce W. Wessels, Vinayak P. Dravid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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 Fe3O 4, BaTiO3 and MgO is [100] Fe3O 4//[100] BaTiO3//[100]MgO and (010) Fe3O 4//(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.

Original languageEnglish (US)
Pages (from-to)300-305
Number of pages6
JournalMicroscopy and Microanalysis
Volume16
Issue number3
DOIs
StatePublished - Jun 1 2010

Keywords

  • dislocation
  • ferroelectricity
  • ferromagnetism
  • interfacial structure
  • transmission electron microscopy

ASJC Scopus subject areas

  • Instrumentation

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