期刊
MICROSCOPY AND MICROANALYSIS
卷 16, 期 3, 页码 300-305出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927610000255
关键词
transmission electron microscopy; interfacial structure; dislocation; ferromagnetism; ferroelectricity
资金
- National Science Foundation (NSF) [DMR-0076097, DMR-0511523]
- Argonne National Laboratory by the U. S. Department of Energy, Office of Science and Office of Basic Energy Sciences [W-31-109-Eng-38]
- NSF at the Materials Research Center of Northwestern University [DMR-0520513]
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
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 R-rms = 0.78 nm). The Fe3O4 film exhibits magnetic domains with a diameter in the range of 0.4-2 mu m.
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