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. 2015 Aug 4;5:12826. doi: 10.1038/srep12826

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(a) and (b) butterfly loop amplitude and phase curves of the 5 nm-BTO film; PFM out-of-plane amplitude (c) and phase (d) images recorded after writing an area of 1 μm x 1 μm with −2.5 V and then the central square with +2.5 V using a biased conductive tip.