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Can interface dislocations degrade ferroelectric properties? S. P. Alpaya)

Summary: Can interface dislocations degrade ferroelectric properties?
S. P. Alpaya)
and I. B. Misirlioglu
Department of Metallurgy and Materials Engineering and Institute of Materials Science, University
of Connecticut, Storrs, Connecticut 06269
V. Nagarajan
Institute for Electronic Materials, Department IFF, Forschungzentrum Juelich D 52425, Germany
R. Ramesh
Department of Materials Science and Engineering and Department of Physics, University of California,
Berkeley, California 94720
(Received 27 February 2004; accepted 1 July 2004)
A thermodynamic analysis has been carried out to investigate the role of dislocations in ferroelectric
materials. Due to the coupling of the stress field of the dislocation and the polarization, there is a
drastic variation in the polarization near the dislocation. These polarization gradients result in strong
depolarizing fields that suppress the polarization in a region that extends over several nanometrers.
In epitaxial ferroelectric films, these polarization gradients should result in the formation of dead
layers that severely degrade ferroelectric properties. The detrimental effect of such regions will be
enhanced in ultrathin ferroelectric thin films, and hence play a critical extrinsic role in size effect
studies of ferroelectrics. 2004 American Institute of Physics. [DOI: 10.1063/1.1788894]
Ferroelectric thin films have gained considerable impor-


Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut


Collections: Materials Science