Enhancing polarization by electrode-controlled strain relaxation in PbTiO₃ heterostructures
Peräntie, J.; Stratulat, M. S.; Hannu, J.; Jantunen, H.; Tyunina, M. (2016-01-12)
APL Materials 4, 016104 (2016); doi: 10.1063/1.4939790
© 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
https://creativecommons.org/licenses/by/3.0/
https://urn.fi/URN:NBN:fi-fe201708158127
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Abstract
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: http://dx.doi.org/10.1063/1.4975656
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