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Nonvolatile Ferroelectric-Domain-Wall Memory Embedded in a Complex Topological Domain Structure.

Wenda Yang1, Guo Tian1, Hua Fan2

  • 1Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China.

Advanced Materials (Deerfield Beach, Fla.)
|January 6, 2022
PubMed
Summary

Researchers developed a stable, nonvolatile memory device using conductive ferroelectric domain walls in BiFeO3 films. This walltronics advancement offers high on/off ratios and excellent endurance for future electronics.

Keywords:
domain-wall memoryferroelectric domain wallspolar topological domains

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Atomic-size conductive ferroelectric domain walls are crucial for novel electronic devices.
  • Walltronics is an emerging field focused on manipulating these domain walls.

Purpose of the Study:

  • To demonstrate a stable, fatigue-resistant nonvolatile memory device using geometrically confined conductive domain walls.
  • To explore the potential of ferroelectric domain walls in topological domain structures for memory applications.

Main Methods:

  • Fabrication of a memory device using epitaxial BiFeO3 film with coaxial electrodes.
  • Deterministic creation and erasure of conductive domain walls within a center-type quadrant topological domain structure.
  • Characterization of domain switching, resistance change, on/off ratio, retention, and cycle endurance.

Main Results:

  • A highly stable and fatigue-resistant nonvolatile memory device was demonstrated.
  • Reversible switching between conductive and insulating states achieved with an on/off ratio >10^4.
  • Device exhibited excellent repeatability over 10^8 cycles and retention >12 days.

Conclusions:

  • The developed device offers a new pathway for high-performance ferroelectric-domain-wall memory.
  • The findings may stimulate further research in the field of walltronics.
  • Geometrically confined domain walls in topological structures show significant promise for advanced electronic applications.