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Issue 1, 2015
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On stoichiometry and intermixing at the spinel/perovskite interface in CoFe2O4/BaTiO3 thin films

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Abstract

The performance of complex oxide heterostructures depends primarily on the interfacial coupling of the two component structures. This interface character inherently varies with the synthesis method and conditions used since even small composition variations can alter the electronic, ferroelectric, or magnetic functional properties of the system. The focus of this article is placed on the interface character of a pulsed laser deposited CoFe2O4/BaTiO3 thin film. Using a range of state-of-the-art transmission electron microscopy methodologies, the roles of substrate morphology, interface stoichiometry, and cation intermixing are determined on the atomic level. The results reveal a surprisingly uneven BaTiO3 substrate surface formed after the film deposition and Fe atom incorporation in the top few monolayers inside the unit cell of the BaTiO3 crystal. Towards the CoFe2O4 side, a disordered region extending several nanometers from the interface was revealed and both Ba and Ti from the substrate were found to diffuse into the spinel layer. The analysis also shows that within this somehow incompatible composite interface, a different phase is formed corresponding to the compound Ba2Fe3Ti5O15, which belongs to the ilmenite crystal structure of FeTiO3 type. The results suggest a chemical activity between these two oxides, which could lead to the synthesis of complex engineered interfaces.

Graphical abstract: On stoichiometry and intermixing at the spinel/perovskite interface in CoFe2O4/BaTiO3 thin films

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Supplementary files

Article information


Submitted
30 Jul 2014
Accepted
03 Nov 2014
First published
10 Nov 2014

Nanoscale, 2015,7, 218-224
Article type
Paper
Author version available

On stoichiometry and intermixing at the spinel/perovskite interface in CoFe2O4/BaTiO3 thin films

V. Tileli, M. Duchamp, A. Axelsson, M. Valant, R. E. Dunin-Borkowski and N. McN. Alford, Nanoscale, 2015, 7, 218
DOI: 10.1039/C4NR04339A

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