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Freestanding BaTiO3 nanodots exhibit domain structures characterized bydistinct quadrants of ferroelastic 90{\deg} domains in transmission electronmicroscopy (TEM) observations. These differ significantly from flux-closuredomain patterns in the same systems imaged by piezoresponse force microscopy.Based upon a series of phase field simulations of BaTiO3 nanodots, we suggestthat the TEM patterns result from a radial electric field arising from electronbeam charging of the nanodot. For sufficiently large charging, this convertsflux-closure domain patterns to quadrant patterns with radial netpolarizations. Not only does this explain the puzzling patterns that have beenobserved in TEM studies of ferroelectric nanodots, but also suggests how tomanipulate ferroelectric domain patterns via electron beams.

Manipulating Ferroelectric Domains in Nanostructures Under Electron Beams