Reducing Coercive-Field Scaling in Ferroelectric Thin Films via Orientation Control

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dc.contributor.authorXu, Ruijuan
dc.contributor.authorGao, Ran
dc.contributor.authorReyes-Lillo, Sebastian E.
dc.contributor.authorSaremi, Sahar
dc.contributor.authorDong, Yongqi
dc.contributor.authorLu, Hongling
dc.contributor.authorChen, Zuhuang
dc.contributor.authorLu, Xiaoyan
dc.contributor.authorQi, Yajun
dc.contributor.authorHsu, Shang-Lin
dc.contributor.authorDamodaran, Anoop R.
dc.contributor.authorZhou, Huai
dc.contributor.authorMartin, Lane W.
dc.contributor.authorNeaton, Jeffrey B.
dc.date.accessioned2022-08-01T22:43:26Z
dc.date.available2022-08-01T22:43:26Z
dc.date.issued2018-05
dc.descriptionIndexación Scopuses
dc.description.abstractThe desire for low-power/voltage operation of devices is driving renewed interest in understanding scaling effects in ferroelectric thin films. As the dimensions of ferroelectrics are reduced, the properties can vary dramatically, including the robust scaling relationship between coercive field (Ec) and thickness (d), also referred to as the Janovec-Kay-Dunn (JKD) law, wherein Ec ? d-2/3. Here, we report that whereas (001)-oriented heterostructures follow JKD scaling across the thicknesses range of 20-330 nm, (111)-oriented heterostructures of the canonical tetragonal ferroelectric PbZr0.2Ti0.8O3 exhibit a deviation from JKD scaling wherein a smaller scaling exponent for the evolution of Ec is observed in films of thickness ≤ 165 nm. X-ray diffraction reveals that whereas (001)-oriented heterostructures remain tetragonal for all thicknesses, (111)-oriented heterostructures exhibit a transition from tetragonal-to-monoclinic symmetry in films of thickness ≤ 165 nm as a result of the compressive strain. First-principles calculations suggest that this symmetry change contributes to the deviation from the expected scaling, as the monoclinic phase has a lower energy barrier for switching. This structural evolution also gives rise to changes in the c/a lattice parameter ratio, wherein this ratio increases and decreases in (001)- and (111)-oriented heterostructures, respectively, as the films are made thinner. In (111)-oriented heterostructures, this reduced tetragonality drives a reduction of the remanent polarization and, therefore, a reduction of the domain-wall energy and overall energy barrier to switching, which further exacerbates the deviation from the expected scaling. Overall, this work demonstrates a route toward reducing coercive fields in ferroelectric thin films and provides a possible mechanism to understand the deviation from JKD scaling. © 2018 American Chemical Society. Author keywordses
dc.description.urihttps://pubs-acs-org.recursosbiblioteca.unab.cl/doi/10.1021/acsnano.8b01399
dc.identifier.citationACS Nano Volume 12, Issue 5, Pages 4736 - 474322 May 2018es
dc.identifier.doi10.1021/acsnano.8b01399
dc.identifier.issn19360851
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/23403
dc.language.isoenes
dc.publisherAmerican Chemical Societyes
dc.rights.licenseCC BY-NC-ND 4.0
dc.subjectFerroelectric Materialses
dc.subjectTunnel Junctionses
dc.subjectPolarizationes
dc.subjectcoercive-field scalinges
dc.subjectSize effectses
dc.subjectThin filmes
dc.subjectX-ray diffractiones
dc.titleReducing Coercive-Field Scaling in Ferroelectric Thin Films via Orientation Controles
dc.typeArtículoes
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