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Anomalous domain periodicity observed in ferroelectric PbTiO3 nanodots having 180 degrees stripe domains

Title
Anomalous domain periodicity observed in ferroelectric PbTiO3 nanodots having 180 degrees stripe domains
Authors
Son, JYSong, SLee, JHJang, HM
POSTECH Authors
Jang, HM
Date Issued
May-2016
Publisher
NATURE PUBLISHING GROUP
Abstract
Nanometer-scale ferroelectric dots and tubes have received a great deal of attention owing to their potential applications to nonvolatile memories and multi-functional devices. As for the size effect of 180 degrees stripe domains in ferroelectric thin films, there have been numerous reports on the thickness-dependent domain periodicity. All these studies have revealed that the domain periodicity (w) of 180 degrees stripe domains scales with the film thickness (d) according to the classical Landau-Lifshitz-Kittel (LLK) scaling law (w proportional to d(1/2)) down to the thickness of -2 nm. In the case of PbTiO3 nanodots, however, we obtained a striking correlation that for the thickness less than a certain critical value, d(c) (-35 nm), the domain width even increases with decreasing thickness of the nanodot, which surprisingly indicates a negative value in the LLK scaling-law exponent. On the basis of theoretical considerations of dc, we attributed this anomalous domain periodicity to the finite lateral-size effect of a ferroelectric nanodot with an additional effect possibly coming from the existence of a thin non-ferroelectric surface layer.
Keywords
AB-INITIO; FILMS; DEPOLARIZATION; DEPENDENCE; PARTICLES; ENERGY
URI
http://oasis.postech.ac.kr/handle/2014.oak/29997
DOI
10.1038/SREP26644
ISSN
2045-2322
Article Type
Article
Citation
SCIENTIFIC REPORTS, vol. 6, 2016-05
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 JANG, HYUN MYUNG
Div of Advanced Materials Science
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