Science Daily April 8, 2019
Previously proposed designs for negative capacitors worked on a temporary, transient basis. An international team of researchers (France, Russia, USA Argonne National Laboratory) created a permanent static negative capacitor which works as a steady-state, reversible device. The prime component of the negative capacitor involves a filling made of a ferroelectric material. By splitting a nanoparticle into two equal ferroelectric domains of opposite polarization, separated by a boundary called a domain wall, they were able to minimize the effect of the total depolarizing electric field. They showed that the ferroelectric nanodot capacitor hosts a stable two-domain state realizing the static reversible negative capacitance device thus opening routes for the extensive use of the negative capacitance in domain wall-based nanoelectronics…read more. Open Access TECHNICAL ARTICLEÂ
This image shows the movement of the domain wall (a-c and b-d) in a capacitor when a charge is added to one side (c). The resulting redistribution of the domain wall causes a negative capacitive effect. Credit: Argonne National Laboratory