Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3058821
Keywords
dielectric polarisation; electric domains; ferroelectric materials; ferroelectric transitions; lead compounds; nanostructured materials; vortices
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Funding
- Alexander von Humboldt Foundation
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Stable polarization distributions of freestanding ferroelectric nanodots with different surface charges are investigated numerically using a phase field model. The out-of-plane components of polarizations are found to be proportional to the density of surface charge. When the density of surface charge exceeds a critical value, the in-plane components of polarizations disappear. It makes ferroelectric nanodots experience an unusual transition from a vortex state to a single-domain state. Simulation results also show that regular multidomain structures can be obtained by means of specified surface charges, which suggests a way to tailor the physical properties for specific applications.
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