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. 2016 Jan 11;6:19092. doi: 10.1038/srep19092

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(a) The sketch of eight possible polarization orientations in a BiFeO₃ crystal cell; (b) the surface morphology, (c) out-of-plane (OP) and (d) in-plane (IP) phase images of the 6 V polarized regions; (e) the OP and (f ) IP phase images of the same region observed with a 90^o-rotated tip, where the [1 0 0] and [0 1 0] are crystal orientations, some domains with P₁, P₂, P₃ and P₄ are marked in (d) and (f ), respectively.