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

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Copyright © 2016, The Author(s)

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(a) PFM-phase image of the sample where −200 V was applied. (b) PFM-phase profile extracted along the blue line on the PFM-phase image. (c) PFM-amplitude image of the same area. (d) PFM-amplitude profile extracted along the blue line. The position of the domain walls are indicated by dotted lines.