Piezoelectric-response of charged 180$^{\circ}$ ferroelectric domain walls

ORAL

Abstract

We report ambient piezoresponse force microscopy (PFM) studies of the multiferroic hexagonal manganite HoMnO$_3$ performed on the cleaved (110) surface of a single crystal specimen. By changing the sample orientation with respect to the cantilever, we observed an unexpected out-of-plane PFM signal at domain walls which depends on domain wall orientation, in addition to the expected in-plane PFM signal in domains. Further studies confirmed that the domain wall PFM signal results from an out-of-plane displacement, which can be explained by a simple model of local elastic response with conservation of unit cell volume at head-on domain walls.

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Authors

  • Edward Lochocki

    Department of Physics and Astronomy and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA

  • Soonyong Park

    Department of Physics, Chung-Ang University, Seoul 156, Republic of Korea

  • Nara Lee

    Department of Physics and Astronomy and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Dept of Phys and Astronomy, Rutgers U., NJ, USA, Department of Physics and Astronomy and Rutgers Center for emergent materials, Rutgers University, Piscataway, NJ 08854 USA

  • S-W. Cheong

    Rutgers Center for Emergent Materials, Rutgers University, Department of Physics and Astronomy and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Dept of Phys and Astronomy, Rutgers U., NJ, USA, Department of Physics and Astronomy and Rutgers Center for emergent materials, Rutgers University, Piscataway, NJ 08854 USA

  • Weida Wu

    Department of Physics and Astronomy and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA, Department of Physics and Astronomy and Rutgers Center for emergent materials, Rutgers University, Piscataway, NJ 08854 USA