4.7 Article

Mobile and immobile boundaries in ferroelectric films

Journal

SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41598-021-81516-w

Keywords

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Funding

  1. Russian Foundation for Basic Research [19-02-00938]
  2. IT SB RAS
  3. French Government Investments for the Future Program, University of Bordeaux Initiative of Excellence (IDEX Bordeaux)
  4. Generalitat de Catalunya [2017SGR 1506]
  5. European Structural and Investment Funds
  6. Czech Ministry of Education, Youth, and Sports [SOLID21, CZ.02.1.01/0.0/0.0/16_019/0000760]
  7. Czech Science Foundation [19-09671S]
  8. Academy of Finland [298409]

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This study examines the interaction between mobile domain walls and immobile columnar boundaries in epitaxial ferroelectric films, showing that the columnar boundaries can substantially modify the behavior of non-ferroelastic domain walls but have a negligible impact on ferroelastic ones. Introducing immobile boundaries into ferroelectric films is proposed as a viable method to modify domain structures and dynamic responses at the nano-scale.
The intrinsic mobile interfaces in ferroelectrics-the domain walls can drive and enhance diverse ferroelectric properties, essential for modern applications. Control over the motion of domain walls is of high practical importance. Here we analyse theoretically and show experimentally epitaxial ferroelectric films, where mobile domain walls coexist and interact with immobile growth-induced interfaces-columnar boundaries. Whereas these boundaries do not disturb the long-range crystal order, they affect the behaviour of domain walls in a peculiar selective manner. The columnar boundaries substantially modify the behaviour of non-ferroelastic domains walls, but have negligible impact on the ferroelastic ones. The results suggest that introduction of immobile boundaries into ferroelectric films is a viable method to modify domain structures and dynamic responses at nano-scale that may serve to functionalization of a broader range of ferroelectric films where columnar boundaries naturally appear as a result of the 3D growth.

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