Temperature-driven evolution of hierarchical nanodomain structure in tetragonal-like BiFeO3 films

摘要

Transmission electron microscopy study of tetragonal-like BiFeO3 filmsreveals a hitherto unreported hierarchical nanodomain structure. The 30-50 nmwide stripe domains with {110} domain walls consist of a substructure oflamellar nanodomains of 8-10 nm width in a herringbone-like arrangement. Insitu heating and cooling reveals a reversible transition from the hierarchicalnanodomain structure to a tweed-like domain structure which is accompanied by afirst-order phase transition near 120 {\deg}C with a thermal hysteresis.