Domain control in ferroelectric nanodots through surface charges

Wang, Jie; Kamlah, Marc
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p262904
Academic Journal
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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