Untangling Electrostatic and Strain Effects on the Polarization of Ferroelectric Superlattices

Ekaterina Khestanova, Nico Dix, Ignasi Fina, Mateusz Scigaj, José Manuel Rebled, César Magén, Sonia Estradé, Francesca Peiró, Gervasi Herranz, Josep Fontcuberta, Florencio Sánchez

    Research output: Contribution to journalArticleResearchpeer-review

    19 Citations (Scopus)

    Abstract

    © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The polarization of ferroelectric superlattices is determined by both electrical boundary conditions at the ferroelectric/paraelectric interfaces and lattice strain. The combined influence of both factors offers new opportunities to tune ferroelectricity. However, the experimental investigation of their individual impact has been elusive because of their complex interplay. Here, a simple growth strategy has permitted to disentangle both contributions by an independent control of strain in symmetric superlattices. It is found that fully strained short-period superlattices display a large polarization whereas a pronounced reduction is observed for longer multilayer periods. This observation indicates that the electrostatic boundary mainly governs the ferroelectric properties of the multilayers whereas the effects of strain are relatively minor.
    Original languageEnglish
    Pages (from-to)6446-6453
    JournalAdvanced Functional Materials
    Volume26
    Issue number35
    DOIs
    Publication statusPublished - 20 Sep 2016

    Keywords

    • BaTiO 3
    • epitaxy
    • ferroelectric superlattices
    • oxides
    • thin films

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