Imperial College London

ProfessorNeilAlford

Central FacultyOffice of the Provost

Associate Provost (Academic Planning)
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Miss Catherine Graham +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Tileli:2014:10.1039/c4nr04339a,
author = {Tileli, V and Duchamp, M and Axelsson, A-K and Valant, M and Dunin-Borkowski, RE and Alford, NM},
doi = {10.1039/c4nr04339a},
journal = {Nanoscale},
pages = {218--224},
title = {On stoichiometry and intermixing at the spinel/perovskite interface in CoFe2O4/BaTiO3 thin films},
url = {http://dx.doi.org/10.1039/c4nr04339a},
volume = {7},
year = {2014}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - 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.
AU - Tileli,V
AU - Duchamp,M
AU - Axelsson,A-K
AU - Valant,M
AU - Dunin-Borkowski,RE
AU - Alford,NM
DO - 10.1039/c4nr04339a
EP - 224
PY - 2014///
SN - 2040-3372
SP - 218
TI - On stoichiometry and intermixing at the spinel/perovskite interface in CoFe2O4/BaTiO3 thin films
T2 - Nanoscale
UR - http://dx.doi.org/10.1039/c4nr04339a
UR - http://hdl.handle.net/10044/1/41550
VL - 7
ER -