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Reversible long-range domain wall motion in an improper ferroelectric.

Manuel Zahn1,2, Aaron Merlin Müller3, Kyle P Kelley4

  • 1Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.

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|February 19, 2025
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Summary
This summary is machine-generated.

Long-range, reversible ferroelectric domain wall motion, exceeding 250 nm, is demonstrated in ErMnO3. This natural phenomenon in improper ferroelectrics offers new possibilities for electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Ferroelectricity

Background:

  • Reversible ferroelectric domain wall motion is typically limited to short ranges (around 10 nm) and requires defect engineering.
  • Understanding domain wall dynamics is crucial for developing advanced ferroelectric devices.

Purpose of the Study:

  • To investigate the intrinsic domain wall dynamics in improper ferroelectric ErMnO3.
  • To demonstrate and characterize long-range, reversible domain wall movements in pristine ErMnO3.

Main Methods:

  • Switching spectroscopy band-excitation piezoresponse force microscopy (SSBE-PFM) for nanometric tracking of domain walls.
  • Electric-field cycling to induce and observe domain wall motion.
  • Phase field simulations to model the observed behavior.

Main Results:

  • ErMnO3 exhibits reversible domain wall movements exceeding 250 nm, far beyond typical ranges.
  • These movements are intrinsic to the material's improper ferroelectricity and topologically protected vortex lines.
  • Domain walls return to their initial positions after significant displacement.

Conclusions:

  • The study reveals intrinsic, long-range reversible domain wall motion in hexagonal manganites like ErMnO3.
  • Topologically protected structural vortex lines act as crucial anchor points for domain walls.
  • These findings open avenues for novel applications in tunable capacitors and sensors due to predictable device behavior.