Figure4.

Examples of coherent nanodiffraction from domains of ferroelectric thin films are shown. A 200 nm-thick BiFeO₃ film grown epitaxially on TbScO₃ with multiple twin domains illuminated by the beam is shown in (a). The measured 002 Bragg peak in (b) was split because of the local lattice tilts. Measurements were also made of a PbTiO₃ thin film with ferroelectric stripe domains (d), shown schematically in (c). The alternating phase of the stripe domains decorated the measured 002 Bragg peak with satellite peaks that encode the phase and shape of the illuminated stripe domains. (Online version in colour.)