Hydrodynamics of domain walls in ferroelectrics and multiferroics: impact on memory devices

Article, Preprint English OPEN
Scott, J. F ; Evans, D. M. ; Gregg, J. M. ; Gruverman, A. (2016)
  • Publisher: American Institute of Physics
  • Related identifiers: doi: 10.1063/1.4959996
  • Subject: QC Physics | QC | Ferroelastics | Domains | Hydrodynamics | sub-03 | NDAS | Condensed Matter - Materials Science | Multiferroics
    arxiv: Condensed Matter::Materials Science | Physics::Fluid Dynamics

We show that switching in ferroelectric lead germanate and lead iron tantalate zirconate titanate (PZTFT) does not resemble the equilibrium domain structure evolution of the Landau-Lifshitz-Kittel model but is instead highly nonequilibrium and similar, respectively, to the Richtmyer-Meshkov instability in liquids and the Helfrich-Hursault sliding instability in liquid crystals. The resulting nano-domain structures in PZTFT are circular or parabolic and involving folding bifurcations. These may have an undesirable impact on ferroelectric thin-film memoriesthat are also ferroelastic.
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