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Domain patterns after (a) 3.4 V and (b) 5.8 V poling. Dark, white, light gray, and dark gray area represent domains with polarizations along [111], [111], [111], and [111], respectively. Head-head, head-tail and tail-tail DWs are colored by orange, light blue and purple, respectively. (c) Average DW movement during each poling process. Sketch of two-step poling process including scan poling by (d) lower and (e) higher electric field. (f) Well-aligned conductive tail-tail DWs are successfully produced.
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