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. 2016 Oct 20;6:35512. doi: 10.1038/srep35512

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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PFM measurements of the PPTi (a) and NPTi (b); PFM magnitude images are presented in a1 and b1, and phase images are presented in a2, and b2. In the magnitude images (a1,b1), bright regions indicate regions with a high piezo-response. The applied AC voltage was 10 V.