Hydrodynamics of domain walls in ferroelectrics and multiferroics: impact on memory devices
Scott, J. F
Evans, D. M.
Gregg, J. M.
- Publisher: American Institute of Physics
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.