Ferroelectric capacitor
Ferroelectric capacitor is a capacitor based on a ferroelectric material. In contrast, traditional capacitors are based on dielectric materials. Ferroelectric devices are used in digital electronics as part of ferroelectric RAM, or in analog electronics as tunable capacitors (varactors).

In memory applications, the stored value of a ferroelectric capacitor is read by applying an
Theory
In a short-circuited ferroelectric capacitor with a metal-ferroelectric-metal (MFM) structure, a charge distribution of screening charges forms at the metal-ferroelectric interface so as to screen the electric displacement of the ferroelectric. Due to these screening charges, there is a voltage drop across the ferroelectric capacitor with screening in the electrode layer that can be obtained using the Thomas-Fermi approach as follows:[1]
Here is the film thickness, and are the electric fields in the film and electrode at the interface, is the spontaneous polarization, , and & are the dielectric constants of the film and the metal electrode.
With perfect electrodes, or for thick films, with the equation reduces to:
See also
External links
References
- S2CID 250818321.