Low-energy structural dynamics of ferroelectric domain walls in hexagonal rare-earth manganites.

ABSTRACT: Domain walls (DWs) in ferroic materials, across which the order parameter abruptly changes its orientation, can host emergent properties that are absent in the bulk domains. Using a broadband (10⁶ to 10¹⁰ Hz) scanning impedance microscope, we show that the electrical response of the interlocked antiphase boundaries and ferroelectric DWs in hexagonal rare-earth manganites (h-RMnO₃) is dominated by the bound-charge oscillation rather than free-carrier conduction at the DWs. As a measure of the rate of energy dissipation, the effective conductivity of DWs on the (001) surfaces of h-RMnO₃ at gigahertz frequencies is drastically higher than that at dc, whereas the effect is absent on surfaces with in-plane polarized domains. First-princi

SUBMITTER: Wu X 

PROVIDER: S-EPMC5425234 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature