Hydrodynamics of Domain Walls in Multiferroics: Impact on Memory Devices
Scott, James F.
Evans, Donald M.
Gregg, J. Marty
- Publisher: American Institute of Physics
QC Physics | QC | Ferroelastics | Domains | Hydrodynamics | NDAS | sub-03 | Multiferroics | Condensed Matter - Materials Science
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.