TITLE

Dielectric nonlinearities in ferroelectric thin-film heterostructures

AUTHOR(S)
Tyunina, M.; Levoska, J.; Leppa¨vuori, S.; Sternberg, A.
PUB. DATE
January 2001
SOURCE
Applied Physics Letters;1/22/2001, Vol. 78 Issue 4, p527
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The influence of the film-electrode interface on the ac-electric field dependence of the dielectric permittivity in ferroelectric thin-film heterostructures has been studied. The dielectric nonlinearities in epitaxial thin-film heterostructures of ferroelectric PbZr[sub 0.65]Ti[sub 0.35]O[sub 3] and relaxor ferroelectric (PbMg[sub 1/3]Nb[sub 2/3]O[sub 3])[sub 0.68]-(PbTiO[sub 3])[sub 0.32] were measured at subswitching fields. A dramatic difference between the dielectric nonlinearities possessed by ferroelectric films and those exhibited by the corresponding heterostructures was revealed both by model evaluations and experimental observations. In the heterostructures, due to the presence of an interface layer the dielectric nonlinearities can be considerably suppressed and their type can be changed compared to those in the films.
ACCESSION #
4710936

 

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