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dc.contributor.author
Belletti, Gustavo Daniel
dc.contributor.author
Dalosto, Sergio Daniel
dc.contributor.author
Tinte, Silvia Noemi
dc.date.available
2016-02-25T17:37:30Z
dc.date.issued
2014-04
dc.identifier.citation
Belletti, Gustavo Daniel; Dalosto, Sergio Daniel; Tinte, Silvia Noemi; Strain-gradient-induced switching of nanoscale domains in free-standing ultrathin films; American Physical Society; Physical Review B; 89; 17; 4-2014; 174104-174104
dc.identifier.issn
0163-1829
dc.identifier.uri
http://hdl.handle.net/11336/4416
dc.description.abstract
We report first-principle atomistic simulations of the effect of local strain gradients on the nanoscale domain morphology of free-standing PbTiO3 ultrathin films. First, the ferroelectric properties of free films at the atomic level are reviewed. For the explored thicknesses (10 to 23 unit cells), we find flux-closure domain structures whose morphology is thickness dependent. A critical value of 20 unit cells is observed: thinner films show structures with 90º domain loops, whereas thicker ones develop, in addition, 180º domain walls, giving rise to structures of the Landau-Lifshitz type. When a local and compressive strain gradient at the top surface is imposed, the gradient is able to switch the polarization of the downward domains, but not to the opposite ones. The evolution of the domain pattern as a function of the strain gradient strength consequently depends on the film thickness. Our simulations indicate that in thinner films, first the 90º domain loops migrate towards the strain-gradient region, and then the polarization in that zone is gradually switched. In thicker films, instead, the switching in the strain-gradient region is progressive, not involving domain-wall motion, which is attributed to less mobile 180º domain walls. The ferroelectric switching is understood based on the knowledge of the local atomic properties, and the results confirm that mechanical flexoelectricity provides a means to control the nanodomain pattern in ferroelectric systems.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Thin Films
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Ferroelctricity
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Atomistic
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Classical Force Field
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Física de los Materiales Condensados
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Strain-gradient-induced switching of nanoscale domains in free-standing ultrathin films
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.journal.volume
89
dc.journal.number
17
dc.journal.pagination
174104-174104
dc.journal.pais
Estados Unidos
dc.journal.ciudad
New York
dc.description.fil
Fil: Belletti, Gustavo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
dc.description.fil
Fil: Dalosto, Sergio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
dc.description.fil
Fil: Tinte, Silvia Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
dc.journal.title
Physical Review B
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.174104
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevB.89.174104
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://arxiv.org/abs/1408.5081
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/issn/0163-1829
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