Abstract
The behaviors of vortex switching in a ferroelectric nanodot on different surface screening conditions are investigated by phase-field simulations. It is found that asymmetric electrical boundary conditions have a significant effect on the formation of vortex domain structures and play a deterministic role in manipulating the vortex chirality by a homogeneous electrostatic field. The results indicate that the critical electric field for vortex switching can be greatly reduced by engineering the asymmetric surface screening conditions in a ferroelectric nanodot with a regular structure and uniform composition.
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