Unusual Ferroelectricity of Trans-Unitcell Ion-Displacement and Multiferroic Soliton in Sodium and Potassium Hydroxides.

@article{Ren2018UnusualFO,
  title={Unusual Ferroelectricity of Trans-Unitcell Ion-Displacement and Multiferroic Soliton in Sodium and Potassium Hydroxides.},
  author={Yangyang Ren and Shuai Dong and Menghao Wu},
  journal={ACS applied materials \& interfaces},
  year={2018},
  volume={10 41},
  pages={
          35361-35366
        }
}
We show the first-principles evidence of a hitherto unreported type of ferroelectricity with ultralong ion-displacement in sodium and potassium hydroxides. Even a small number of proton vacancies can completely change the mode of proton-transfer from intra-unitcell to trans-unitcell, giving rise to multiferroic soliton with "mobile" magnetism and a tremendous polarization that can be orders of magnitude higher compared with most perovskite ferroelectrics. Their vertical polarizations of thin… 
Fullerene-based 0D ferroelectrics/multiferroics for ultrahigh-density and ultrafast nonvolatile memories.
  • T. Zhong, Menghao Wu
  • Medicine, Materials Science
    Physical chemistry chemical physics : PCCP
  • 2020
TLDR
The first-principles design of 0D ferroelectrics/multiferroics based on polar functionalized fullerene is shown, which turns out that the ferroelectric polarization of endohedral metallofullerenes can be reversed with the diffusion of metal ions inside when the fullerene is fixed on a substrate.
Magnetoelectricity in Multiferroics: a Theoretical Perspective
The key physical property of multiferroic materials is the existence of a coupling between magnetism and polarization, i.e. magnetoelectricity. The origin and manifestations of magnetoelectricity can
Magnetoelectricity in multiferroics: a theoretical perspective
TLDR
The fundamental physics that causes magnetoelectricity from a theoretical viewpoint is described and mainstream physical mechanisms in both single-phase multiferroics and magnetoeLECTric heterostructures are focused on.
Ultra-high piezoelectric coefficients and strain-sensitive Curie temperature in hydrogen-bonded systems
TLDR
The first-principles plus Monte Carlo simulation evidence that many hydrogen-bonded ferroelectrics can be ideal candidates, which are also flexible and lead-free, and an unprecedented ultra-high piezoelectric coefficient of 2058 pC/N can be obtained.

References

SHOWING 1-10 OF 28 REFERENCES
Hydrogen-bonding molecular chains for high-temperature ferroelectricity.
TLDR
By the direct observations of the electric polarization field hysteresis on the molecular crystals with β-diketone enol or carboxylic unit, bistability of the hydrogen-bonding chains has been proved to functionalize the ferroelectricity of high polarization performance at room temperature.
Chemically Functionalized Phosphorene: Two-Dimensional Multiferroics with Vertical Polarization and Mobile Magnetism.
TLDR
First-principles evidence is shown that a halogen-intercalated phosphorene bilayer can be multiferroic with most long-sought advantages, giving rise to a possible approach of realizing single atom memory for high-density data storage.
Ferroelectricity in Ultrathin Perovskite Films
TLDR
A synchrotron x-ray study of lead titanate as a function of temperature and film thickness for films as thin as a single unit cell implies that no thickness limit is imposed on practical devices by an intrinsic ferroelectric size effect.
Proton transfer ferroelectricity/multiferroicity in rutile oxyhydroxides.
TLDR
The first-principle evidence of a new class of ferroelectrics/multiferroics is given and β-CrOOH is revealed to be a combination of a high Curie temperature in-plane type-I multiferroic and vertical type-II multiferROics, which is strain tunable and may give a desirable coupling between magnetism and ferroelectricity.
Multiferroic materials based on organic transition-metal molecular nanowires.
We report on the density functional theory aided design of a variety of organic ferroelectric and multiferroic materials by functionalizing crystallized transition-metal molecular sandwich nanowires
Two-Dimensional Metal-Free Organic Multiferroic Material for Design of Multifunctional Integrated Circuits.
TLDR
C6N8H organic network is reported as being the first 2D organic multiferroic material with coexisting ferromagnetic and ferroelectric properties and it is found that hydrogenation and carbon doping can transform the 2D g-C3N4 network from an insulator to an n-type/p-type magnetic semiconductor with modest bandgap.
Ferroelectricity in Covalently functionalized Two-dimensional Materials: Integration of High-mobility Semiconductors and Nonvolatile Memory.
TLDR
First-principles evidence is shown toward the realization of a new class of two-dimensional (2D) ferro electric semiconductors through covalent functionalization of many prevailing 2D materials, which possess high mobility, modest bandgaps, and distinct ferroelectricity that can be exploited for developing various heterostructural devices with desired functionalities.
Critical thickness for ferroelectricity in perovskite ultrathin films
TLDR
It is shown that, contrary to current thought, BaTiO3 thin films between two metallic SrRuO3 electrodes in short circuit lose their ferro electric properties below a critical thickness of about six unit cells, suggesting the existence of a lower limit for the thickness of useful ferroelectric layers in electronic devices.
Binary Compound Bilayer and Multilayer with Vertical Polarizations: Two-Dimensional Ferroelectrics, Multiferroics, and Nanogenerators.
TLDR
First-principles evidence of 2D vertical ferroelectricity induced by interlayer translation is reported, which exists extensively in the graphitic bilayer of BN, AlN, ZnO, MoS2, GaSe, etc.
High electron mobility, quantum Hall effect and anomalous optical response in atomically thin InSe.
TLDR
Encapsulated 2D InSe expands the family of graphene-like semiconductors and, in terms of quality, is competitive with atomically thin dichalcogenides and black phosphorus.
...
1
2
3
...