Periodic Giant Polarization Gradients in Doped BiFeO3 Thin Films

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dc.contributor.authorCampanini, Marcoko
dc.contributor.authorErni, Rolfko
dc.contributor.authorYang, Chan-Hoko
dc.contributor.authorRamesh, Ramamoorthyko
dc.contributor.authorRossell, Marta D.ko
dc.date.accessioned2018-03-23T00:15:51Z-
dc.date.available2018-03-23T00:15:51Z-
dc.date.created2018-03-20-
dc.date.created2018-03-20-
dc.date.created2018-03-20-
dc.date.issued2018-02-
dc.identifier.citationNANO LETTERS, v.18, no.2, pp.717 - 724-
dc.identifier.issn1530-6984-
dc.identifier.urihttp://hdl.handle.net/10203/240945-
dc.description.abstractThe ultimate challenge for the development of new multiferroics with enhanced properties lies in achieving nanoscale control of the coupling between different ordering parameters. In oxide-based multiferroics, substitutional cation dopants offer the unparalleled possibility to modify both the electric and magnetic properties at a local scale. Herein it is demonstrated the formation of a dopant-controlled polar pattern in BiFeO3 leading to the spontaneous instauration of periodic polarization waves. In particular, nonpolar Ca-doped rich regions act as spacers between consecutive dopant-depleted regions displaying coupled ferroelectric states. This alternation of layers with different ferroelectric state creates a novel vertical polar structure exhibiting giant polarization gradients as large as 70 mu C cm(-2) across 30 angstrom thick domains. The drastic change in the polar state of the film is visualized using high-resolution differential phase-contrast imaging able to map changes in ferroelectric polarization at atomic scale. Furthermore, a periodic distortion in the Fe-O-Fe bonding angle suggests a local variation in the magnetic ordering. The findings provide a new insight into the role of doping and reveal hitherto unexplored means to tailor the functional properties of multiferroics by doping engineering.-
dc.languageEnglish-
dc.publisherAMER CHEMICAL SOC-
dc.subjectFERROELECTRIC PROPERTIES-
dc.subjectROOM-TEMPERATURE-
dc.subjectMULTIFERROICS-
dc.subjectSTRAIN-
dc.subjectENHANCEMENT-
dc.subjectPEROVSKITES-
dc.subjectMICROSCOPY-
dc.titlePeriodic Giant Polarization Gradients in Doped BiFeO3 Thin Films-
dc.typeArticle-
dc.identifier.wosid000425559700010-
dc.identifier.scopusid2-s2.0-85042097334-
dc.type.rimsART-
dc.citation.volume18-
dc.citation.issue2-
dc.citation.beginningpage717-
dc.citation.endingpage724-
dc.citation.publicationnameNANO LETTERS-
dc.identifier.doi10.1021/acs.nanolett.7b03817-
dc.contributor.localauthorYang, Chan-Ho-
dc.contributor.nonIdAuthorCampanini, Marco-
dc.contributor.nonIdAuthorErni, Rolf-
dc.contributor.nonIdAuthorRamesh, Ramamoorthy-
dc.contributor.nonIdAuthorRossell, Marta D.-
dc.description.isOpenAccessY-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorBismuth ferrite-
dc.subject.keywordAuthorferroelectric polarization-
dc.subject.keywordAuthordoping-
dc.subject.keywordAuthorscanning transmission electron microscopy-
dc.subject.keywordAuthordifferential-phase contrast-
dc.subject.keywordAuthorBismuth ferrite-
dc.subject.keywordAuthorferroelectric polarization-
dc.subject.keywordAuthordoping-
dc.subject.keywordAuthorscanning transmission electron microscopy-
dc.subject.keywordAuthordifferential-phase contrast-
dc.subject.keywordPlusFERROELECTRIC PROPERTIES-
dc.subject.keywordPlusROOM-TEMPERATURE-
dc.subject.keywordPlusMULTIFERROICS-
dc.subject.keywordPlusSTRAIN-
dc.subject.keywordPlusENHANCEMENT-
dc.subject.keywordPlusPEROVSKITES-
dc.subject.keywordPlusMICROSCOPY-
dc.subject.keywordPlusFERROELECTRIC PROPERTIES-
dc.subject.keywordPlusROOM-TEMPERATURE-
dc.subject.keywordPlusMULTIFERROICS-
dc.subject.keywordPlusSTRAIN-
dc.subject.keywordPlusENHANCEMENT-
dc.subject.keywordPlusPEROVSKITES-
dc.subject.keywordPlusMICROSCOPY-
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