Defect and interfacial structure of heteroepitaxial Fe3O 4/BaTiO3 bilayers

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

doi:10.1017/S1431927610000255

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 journal › Article › peer-review

4 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 language	English (US)
Pages (from-to)	300-305
Number of pages	6
Journal	Microscopy and Microanalysis
Volume	16
Issue number	3
DOIs	https://doi.org/10.1017/S1431927610000255
State	Published - Jun 2010

Keywords

dislocation
ferroelectricity
ferromagnetism
interfacial structure
transmission electron microscopy

ASJC Scopus subject areas

Instrumentation

Access to Document

10.1017/S1431927610000255

Cite this

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title = "Defect and interfacial structure of heteroepitaxial Fe3O 4/BaTiO3 bilayers",

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.",

keywords = "dislocation, ferroelectricity, ferromagnetism, interfacial structure, transmission electron microscopy",

author = "Sujing Xie and Sterbinsky, {George E.} and Wessels, {Bruce W.} and Dravid, {Vinayak P.}",

year = "2010",

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AU - Xie, Sujing

AU - Sterbinsky, George E.

AU - Wessels, Bruce W.

AU - Dravid, Vinayak P.

PY - 2010/6

Y1 - 2010/6

N2 - 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.

AB - 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.

KW - dislocation

KW - ferroelectricity

KW - ferromagnetism

KW - interfacial structure

KW - transmission electron microscopy

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