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Functional Behaviour of Thin Film Dielectric Superlattices

Published online by Cambridge University Press:  17 March 2011

J. M. Gregg ,
M. H. Corbett ,
D. O'Neill ,
G. Catalan  and
R. M. Bowman
J. M. Gregg
Affiliation:
Department of Pure and Applied Physics The Queen's University of Belfast Belfast BT7 1NN, U. K
M. H. Corbett
Affiliation:
Department of Pure and Applied Physics The Queen's University of Belfast Belfast BT7 1NN, U. K
D. O'Neill
Affiliation:
Department of Pure and Applied Physics The Queen's University of Belfast Belfast BT7 1NN, U. K
G. Catalan
Affiliation:
Department of Pure and Applied Physics The Queen's University of Belfast Belfast BT7 1NN, U. K
R. M. Bowman
Affiliation:
Department of Pure and Applied Physics The Queen's University of Belfast Belfast BT7 1NN, U. K
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Abstract

Pulsed laser deposition has been used to fabricate thin-film capacitor structures in which the dielectric layer is a superlattice. The properties of two superlattice systems were investigated as a function of superlattice wavelength (δ) – one based on barium strontium titanate and the other on lead-based relaxor electroceramics. In both systems the dielectric constant was significantly enhanced at stacking wavelengths of a few unit cells. However, the dielectric enhancement seen in the barium strontium titanate superlattices was found to be due to Maxwell-Wagner effects, whereas in the relaxor superlattices Maxwell-Wagner behaviour was not evident; rather, the dielectric enhancement was associated with the onset of polar coupling aroundδ ∼ 10nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 688: Symposium C – Ferroelectric Thin Films X , 2001 , C6.7.1
Copyright
Copyright © Materials Research Society 2002

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