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Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7

Author

Listed:
  • K. A. Smith

    (University of Tennessee)

  • E. A. Nowadnick

    (New Jersey Institute of Technology
    Cornell University
    University of California, Merced)

  • S. Fan

    (University of Tennessee)

  • O. Khatib

    (University of Colorado
    Lawrence Berkeley National Laboratory)

  • S. J. Lim

    (Rutgers University
    Rutgers University)

  • B. Gao

    (Rutgers University)

  • N. C. Harms

    (University of Tennessee)

  • S. N. Neal

    (University of Tennessee)

  • J. K. Kirkland

    (University of Tennessee)

  • M. C. Martin

    (Lawrence Berkeley National Laboratory)

  • C. J. Won

    (Pohang University of Science and Technology)

  • M. B. Raschke

    (University of Colorado)

  • S.-W. Cheong

    (Rutgers University
    Rutgers University
    Pohang University of Science and Technology)

  • C. J. Fennie

    (Cornell University)

  • G. L. Carr

    (Brookhaven National Laboratory)

  • H. A. Bechtel

    (Lawrence Berkeley National Laboratory)

  • J. L. Musfeldt

    (University of Tennessee
    University of Tennessee)

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$${}^{\circ }$$∘ ferroelectric) domain walls in the hybrid improper ferroelectric Ca$${}_{3}$$3Ti$${}_{2}$$2O$${}_{7}$$7. 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.

Suggested Citation

  • K. A. Smith & E. A. Nowadnick & S. Fan & O. Khatib & S. J. Lim & B. Gao & N. C. Harms & S. N. Neal & J. K. Kirkland & M. C. Martin & C. J. Won & M. B. Raschke & S.-W. Cheong & C. J. Fennie & G. L. Car, 2019. "Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13066-9
    DOI: 10.1038/s41467-019-13066-9
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