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Related Concept Videos

Ferromagnetism01:31

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Electrostatic Boundary Conditions in Dielectrics01:27

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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The Electrical Double Layer01:30

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Updated: Mar 3, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Stable charged antiparallel domain walls in hyperferroelectrics.

S Liu1, R E Cohen1,2

  • 1Extreme Materials Initiative, Geophysical Laboratory, Carnegie Institution for Science, Washington, DC 20015-1305, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 27, 2017
PubMed
Summary
This summary is machine-generated.

Charged domain walls in hyperferroelectrics and canonical ferroelectrics can be stabilized, reducing band gaps and enhancing conductivity. This finding opens new avenues for electronic applications using ferroelectric materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • 180° domain walls are common topological defects in ferroelectrics, separating antiparallel polarization domains.
  • Charged 180° domain walls are typically unstable in normal ferroelectrics due to depolarization fields.

Purpose of the Study:

  • To investigate the stability and properties of both neutral and charged 180° domain walls in hyperferroelectrics.
  • To explore the possibility of stabilizing charged domain walls in canonical ferroelectrics without external modifications.

Main Methods:

  • Utilizing density functional theory (DFT) for first-principles electronic structure calculations.
  • Obtaining zero-temperature equilibrium structures of domain walls.

Main Results:

  • Successfully obtained equilibrium structures for head-to-head and tail-to-tail domain walls in hexagonal hyperferroelectrics.
  • Demonstrated stabilization of charged domain walls in LiNbO3 without dopants, defects, or clamping.
  • Showed that charged domain walls can reduce or close the band gap, forming quasi-two-dimensional electron/hole gases with high conductivity.

Conclusions:

  • Charged domain walls are feasible in hyperferroelectrics and certain canonical ferroelectrics.
  • Stabilized charged domain walls can significantly alter material properties, enabling enhanced electrical conductivity.
  • This research offers potential for novel electronic devices based on engineered ferroelectric domain walls.