A 1D periodic structure of ferroelectric domains in epitaxial BiFeO3 films is created. By careful control of the growth mechanism for the SrRuO3 bottom electrode, its in-plane lattice parameters are confined by the underlying DyScO3 (110)O single- crystal substrate, enabling the formation of an expitaxial film of (110)O SrRuO3 with a single structural domain (see figure).
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