Investigation of Negative Capacitance Effect from Domain Switching Dynamics

In this work, the negative capacitance (NC) effect of a ferroelectric (FE) capacitor is experimentally investigated. Both negative and positive capacitance in FE are observed, and further analyzed from the perspective of domain switching dynamics. It is shown that the negative or positive capacitance in FE depends on the competition between the expansion and contraction forces of new domains. Experimental results indicate that a small and slow voltage drop near the maximum sweeping voltage applied on FE is more helpful to enhance the NC effect.