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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, JY; Song, S; Lee, JH; Jang, HM; 장현명
Issue Date 
2016-05
Journal Title 
SCIENTIFIC REPORTS
Volume 
6
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 
http://dx.doi.org/10.1038/SREP26644
ISSN 
2045-2322
Article Type 
ARTICLE
Appears in Collections
Division of Advanced Materials Science (AMS) (첨단재료과학부) > 1. Journal Papers

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