Related Experiment Video
Updated: Aug 31, 2025
07:03
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
8.9K
Giant voltage amplification from electrostatically induced incipient ferroelectric states
Mónica Graf1, Hugo Aramberri1, Pavlo Zubko2
1Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg.
Nature Materials
|August 25, 2022
Summary
Ferroelectric materials exhibit negative capacitance, enabling voltage amplification in heterostructures for low-power electronics. Optimizing this effect involves tuning ferroelectric layers, particularly near the incipient ferroelectric state, for giant amplification.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Physics
Background:
- Ferroelectric materials can exhibit negative capacitance under specific electric boundary conditions.
- This negative capacitance effect, when integrated into heterostructures, leads to voltage amplification, promising advancements in low-power electronic devices.
Purpose of the Study:
- To develop an electrostatic theory for ferroelectric/dielectric superlattices to understand and optimize negative capacitance effects.
- To investigate the relationship between negative permittivity in ferroelectrics and voltage amplification in adjacent dielectrics.
- To identify key factors influencing voltage amplification in ferroelectric/dielectric superlattices.
Main Methods:
- Development of an electrostatic theory for ferroelectric/dielectric superlattices.
- Computational simulations of lead titanate/strontium titanate (PbTiO3/SrTiO3) superlattices.
Main Results:
- Established a theoretical link between the negative permittivity of ferroelectric layers and voltage amplification in dielectric layers.
- Simulations revealed that bringing PbTiO3 close to its incipient ferroelectric state results in significant voltage amplification (up to tenfold).
Conclusions:
- Ferroelectric/dielectric superlattices offer a viable platform for achieving substantial voltage amplification.
- Tuning the ferroelectric material, specifically towards the incipient ferroelectric state, is crucial for maximizing voltage amplification for potential low-power electronics applications.
More Related Videos
10:40A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
8.3K
08:00Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
11.2K
Related Concept Videos
01:15Van de Graaff Generator
1.8K
Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
1.8K
01:31Dielectric Polarization in a Capacitor
4.9K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.9K
01:27Induced Electric Fields: Applications
1.8K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
1.8K
01:17Ampere-Maxwell's Law: Problem-Solving
734
A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of...
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of...
734
01:23Induced Electric Fields
3.9K
The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
3.9K
01:16Induction
4.2K
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
A...
4.2K