University of Oulu

APL Materials 4, 016104 (2016); doi: 10.1063/1.4939790

Enhancing polarization by electrode-controlled strain relaxation in PbTiO₃ heterostructures

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Author: Peräntie, J.1; Stratulat, M. S.1; Hannu, J.1;
Organizations: 1Microelectronics and Materials Physics Laboratories, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
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Language: English
Published: American Institute of Physics, 2016
Publish Date: 2017-08-16


A large remanent polarization close to theoretical value 80 𝜇C/cm² of bulk PbTiO₃ is achieved in epitaxial heterostructures of (120–600)-nm-thick PbTiO₃ films grown by pulsed laser deposition on (001) SrTiO₃ substrate using a 100-nm-thick SrRuO₃ bottom electrode layer. The heterostructures employing a 50-nm-thick electrode exhibit a significantly smaller polarization of ≤60 𝜇C/cm². A detailed x-ray diffraction analysis of the crystal structure allows for relating this large polarization to electrode-controlled relaxation of epitaxial strain in PbTiO₃. Based on the observed results, we anticipate that the electrode-promoted strain relaxation can be used to enhance polarization in other epitaxial ferroelectric films.

Erratum: “Enhancing polarization by electrode-controlled strain relaxation in PbTiO₃ heterostructures” [APL Mater. 4, 016104 (2016)], APL Materials 5, 029901 (2017); doi:

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Series: APL materials
ISSN: 2166-532X
ISSN-E: 2166-532X
ISSN-L: 2166-532X
Volume: 4
Issue: 1
Article number: 016104
DOI: 10.1063/1.4939790
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
216 Materials engineering
Funding: This work was supported by the Finnish Funding Agency for Innovation (Grant No. 400.31.2013).
Copyright information: © 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.