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. 2016 Sep 9;6:33098. doi: 10.1038/srep33098

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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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(a) Under-focus (b) best-focus and (c) over-focus images of the same area taken at 450 °C. (d) Evolution of the domain sizes with focus values expressed in coil current (mA): under-focus indicated by the light blue bar, best-focus indicated by the fuchsia dashed line, and over-focus images indicated by the light pink bar. Solid lines are linear fit of slope +0.06 μm/mA and −0.06 μm/mA. Green squares indicate the domain size as measured by PFM and reside on the best-focus line.