Abstract
The electrode size effect on polarization switching in SrBi2Ta2O9 (SBT) thin films were examined with top electrode areas ranged from 7.85×10−5 cm2 to 7.85×10−3 cm2. The experimental data indicated that the electrode size has a strong effect on switching time, where the switching time of the SBT thin films increases significantly with increasing top electrode area. To clarify its origin, the capacitance of the samples was measured and various external loads of the measuring circuit were tested. It is found that the switching time increase is corresponding to the capacitance increase with the electrode area and nearly linear with external load resistance. Therefore, in our experiment, the electrode size effect on the switching time is determined as a non-intrinsic property of ferroelectric thin films.
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