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Polarization curling and flux closures in multiferroic tunnel junctions
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Peters, Jonathan J. P., Apachitei, Geanina, Beanland, R., Alexe, M. (Marin) and Sánchez, Ana M. (2016) Polarization curling and flux closures in multiferroic tunnel junctions. Nature Communications, 7 . 13484 . doi:10.1038/ncomms13484 ISSN 2041-1723.
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Official URL: http://doi.org/10.1038/ncomms13484
Abstract
Formation of domain walls in ferroelectrics is not energetically favourable in low-dimensional systems. Instead, vortex-type structures are formed that are driven by depolarization fields occurring in such systems. Consequently, polarization vortices have only been experimentally found in systems in which these fields are deliberately maximized, that is, in films between insulating layers. As such configurations are devoid of screening charges provided by metal electrodes, commonly used in electronic devices, it is wise to investigate if curling polarization structures are innate to ferroelectricity or induced by the absence of electrodes. Here we show that in unpoled Co/PbTiO3/(La,Sr)MnO3 ferroelectric tunnel junctions, the polarization in active PbTiO3 layers 9 unit cells thick forms Kittel-like domains, while at 6 unit cells there is a complex flux-closure curling behaviour resembling an incommensurate phase. Reducing the thickness to 3 unit cells, there is an almost complete loss of switchable polarization associated with an internal gradient.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Library of Congress Subject Headings (LCSH): | Ferroelectricity, Ferroelectric crystals, Capacitors, Electrodes | ||||||||
Journal or Publication Title: | Nature Communications | ||||||||
Publisher: | Nature Publishing Group | ||||||||
ISSN: | 2041-1723 | ||||||||
Official Date: | 16 November 2016 | ||||||||
Dates: |
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Volume: | 7 | ||||||||
Article Number: | 13484 | ||||||||
DOI: | 10.1038/ncomms13484 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 27 February 2017 | ||||||||
Date of first compliant Open Access: | 27 February 2017 | ||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), Royal Society (Great Britain). Wolfson Research Merit Award (RSWRMA) | ||||||||
Grant number: | EP/L505110/1 (EPSRC) |
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