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. 2016 Mar 22;6:23299. doi: 10.1038/srep23299

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(a) AFM topography, (b) PFM amplitude, and (c) PFM phase images of BFO nano-islands. (d) Dependence of the PFM phase (red) and PFM amplitude (blue) on the applied voltage as swept between −5 V and +5 V, which are measured at a point on a single BFO nano-island. Polarization switching does not occur even with a high applied voltage.