Interesting evidence for template-induced ferroelectric behavior in ultra-thin titanium dioxide films grown on (110) neodymium gallium oxide substrates

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dc.contributor.authorDeepak, Nitin
dc.contributor.authorCaro, Miguel A.
dc.contributor.authorKeeney, Lynette
dc.contributor.authorPemble, Martyn E.
dc.contributor.authorWhatmore, Roger W.
dc.contributor.funderIrish Research Council for Science, Engineering and Technologyen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderHigher Education Authorityen
dc.date.accessioned2019-04-08T11:18:46Z
dc.date.available2019-04-08T11:18:46Z
dc.date.issued2014-01-10
dc.date.updated2019-03-26T09:14:35Z
dc.description.abstractThe first evidence for room-temperature ferroelectric behavior in anatase-phase titanium dioxide (a-TiO2) is reported. Behavior strongly indicative of ferroelectric characteristics is induced in ultra-thin (20 nm to 80 nm) biaxially-strained epitaxial films of a-TiO2 deposited by liquid injection chemical vapor deposition onto (110) neodymium gallium oxide (NGO) substrates. The films exhibit significant orthorhombic strain, as analyzed by X-ray diffraction and high-resolution transmission electron microscopy. The films on NGO show a switchable dielectric spontaneous polarization when probed by piezoresponse force microscopy (PFM), the ability to retain polarization information written into the film using the PFM tip for extended periods (several hours) and at elevated temperatures (up to 100 °C) without significant loss, and the disappearance of the polarization at a temperature between 180 and 200 °C, indicative of a Curie temperature within this range. This combination of effects constitutes strong experimental evidence for ferroelectric behavior, which has not hitherto been reported in a-TiO2 and opens up the possibility for a range of new applications. A model is presented for the effects of large in-plane strains on the crystal structure of anatase which provides a possible explanation for the experimental observations.en
dc.description.sponsorshipIrish Research Council for Science, Engineering and Technology (International Centre for Graduate Education in Micro & Nano Engineering, ICGEE); Higher Education Authority (HEA Program for Research in Third Level Institutions (2007–2011) via the INSPIRE program)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationDeepak, N., Caro, M. A., Keeney, L., Pemble, M. E. and Whatmore, R. W. (2014) 'Interesting Evidence for Template-Induced Ferroelectric Behavior in Ultra-Thin Titanium Dioxide Films Grown on (110) Neodymium Gallium Oxide Substrates', Advanced Functional Materials, 24(19), pp. 2844-2851. doi: 10.1002/adfm.201302946en
dc.identifier.doi10.1002/adfm.201302946en
dc.identifier.eissn1616-3028
dc.identifier.endpage2851en
dc.identifier.issn1616-301X
dc.identifier.issued19en
dc.identifier.journaltitleAdvanced Functional Materialsen
dc.identifier.startpage2844en
dc.identifier.urihttps://hdl.handle.net/10468/7725
dc.identifier.volume24en
dc.language.isoenen
dc.publisherWileyen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Strategic Research Cluster/07/SRC/I1172/IE/SRC FORME: Functional Oxides and Related Materials for Electronics/en
dc.relation.urihttps://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201302946
dc.rights© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Deepak et al (2014), Interesting Evidence for Template‐Induced Ferroelectric Behavior in Ultra‐Thin Titanium Dioxide Films Grown on (110) Neodymium Gallium Oxide Substrates. Adv. Funct. Mater., 24: 2844-2851, which has been published in final form at https://doi.org/10.1002/adfm.201302946. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archivingen
dc.subjectFerroelectricsen
dc.subjectStrainen
dc.subjectChemical vapor depositionen
dc.subjectAtomic vapor depositionen
dc.subjectAnataseen
dc.titleInteresting evidence for template-induced ferroelectric behavior in ultra-thin titanium dioxide films grown on (110) neodymium gallium oxide substratesen
dc.typeArticle (peer-reviewed)en
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