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Related Experiment Videos

Lattice-scale domain wall dynamics in ferroelectrics.

Hongzhou Ma1, Won-Jeong Kim, James S Horwitz

  • 1Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, Pennsylvania 15260, USA.

Physical Review Letters
|December 20, 2003
PubMed
Summary

Lattice-scale effects on ferroelectric domain walls were directly observed for the first time. Narrow band noise in ferroelectric domain dynamics is linked to lattice pinning, as shown by atomic-force microscopy. Keywords: ferroelectric domain walls, lattice-scale effects, atomic-force microscopy, narrow band noise.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Ferroelectric domain walls are atomically thin interfaces.
  • Their dynamics are crucial for device performance but are sensitive to lattice potentials.
  • Lattice-scale effects on domain wall dynamics have remained unobserved.

Purpose of the Study:

  • To directly observe and characterize lattice-scale effects on ferroelectric domain wall dynamics.
  • To investigate the nature of fluctuations and noise in domain wall motion.

Main Methods:

  • Utilized atomic-force microscopy (AFM) to probe local domain dynamics in thin-film ferroelectrics.
  • Applied combined DC and AC electric fields to drive domain wall motion.
  • Performed Fourier analysis on observed piezoresponse fluctuations.

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Main Results:

  • Observed fluctuations in local piezoresponse under combined electric driving.
  • Identified both narrow band and broad band noise, along with Barkhausen jumps.
  • Attributed narrow band noise to dynamics associated with lattice-scale pinning.

Conclusions:

  • Direct evidence of lattice-scale effects on ferroelectric domain wall dynamics was obtained.
  • The observed narrow band noise provides insight into pinning mechanisms at the atomic scale.
  • A simple physical model successfully reproduced the observed narrow band noise, validating the findings.