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Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca<sub>3</sub>Ti<sub>2</sub>O<sub>7</sub>

ORAL

Abstract

Ferroic materials are well known to exhibit heterogeneity in the form of domain walls. Understanding the properties of these boundaries is crucial for controlling functionality with external stimuli and for realizing their potential for ultra-low power memory and logic devices as well as novel computing architectures. In this work, we employ synchrotron-based near-field infrared nano-spectroscopy to reveal the vibrational properties of ferroelastic (90° ferroelectric) domain walls in the hybrid improper ferroelectric Ca3Ti2O7. By locally mapping the Ti-O stretching and Ti-O-Ti bending modes, we reveal how structural order parameters rotate across a wall. Thus, we link observed near-field amplitude changes to underlying structural modulations and test ferroelectric switching models against real space measurements of local structure. This initiative opens the door to broadband infrared nano-imaging of heterogeneity in ferroics.

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Presenters

  • Kevin Arthur Smith

    Chemistry, University of Tennessee, Knoxville, Department of Chemistry, University of Tennessee, Knoxville, Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA

Authors

  • Kevin Arthur Smith

    Chemistry, University of Tennessee, Knoxville, Department of Chemistry, University of Tennessee, Knoxville, Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA

  • Elizabeth Nowadnick

    Materials Science and Engineering, University of California, Merced, Materials Science and Engineering, University of California Merced, University of California, Merced, Material Science and Engineering, University of California, Merced

  • Shiyu Fan

    University of Tennessee, Physics, University of Tennessee, Knoxville, Physics and Astronomy, University of Tennessee, Knoxville

  • Omar Khatib

    Physics and Chemistry, University of Colorado, Boulder

  • Seong Joon Lim

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

  • Bin Gao

    Physics and Astronomy, Rutgers University, Rice Univ

  • Nathan Harms

    Chemistry, University of Tennessee, Knoxville

  • Sabine Neal

    Chemistry, University of Tennessee, Knoxville, Department of Chemistry, University of Tennessee, Knoxville

  • Justin Kirkland

    Chemistry, University of Tennessee, Knoxville

  • Michael Martin

    Advanced Light Source Division, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory

  • Choong-Jae Won

    Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technology and Laboratory of Pohang Emergent Materials, Pohang Accelerator Laboratory, Korea, Laboratory for Pohang Emergent Materials, Pohang Accelerator Laboratory and Max Planck POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology

  • Markus B. Raschke

    University of Colorado, Boulder, Physics and Chemistry, University of Colorado, Boulder, University of Colorado Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado - Boulder, Department of Physics, Department of Chemistry and JILA, University of Colorado, Boulder, Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Physics, University of Colorado, Boulder, Physics, Chemistry, and JILA, University of Colorado, Boulder

  • Sang-Wook Cheong

    Rutgers University, R-CEM & Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials, Rutgers University, Department of Physics and Astronomy, Center for Emergent Materials, Rutgers University; Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technol, Physics and Astronomy, Rutgers University, Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers University, Piscataway, Department of Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Department of Physics, Rutgers University, Physics & Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Physics, Rutgers University, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • Craig Fennie

    School of Applied and Engineering Physics, Cornel University, Cornell University

  • G Carr

    National Synchrotron Light Source II, Brookhaven National Lab, Brookhaven National Lab, Brookhaven National Laboratory

  • Hans Bechtel

    Advanced Light Source Division, Lawrence Berkeley National Lab, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory

  • Janice L Musfeldt

    University of Tennessee, Chemistry, University of Tennessee, Knoxville