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. 2015 Jul 1;5:11625. doi: 10.1038/srep11625

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a,b Spatial derivatives of the energy landscape (U) with respect to the [100] (a) and [010] directions (b) of the vicinal BFO (001) film (see Fig. 4c). The spatial derivatives correspond to the pinning forces which impedes the propagation of DWs along [100]/[−100] (a) and [010]/[0–10] (b) directions. The stripe-like distribution of the pinning force along the [010] direction in a shows a correlation with the step-terrace structure of the underlying miscut STO substrate.