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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

3.6K
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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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Valence Bond Theory02:42

Valence Bond Theory

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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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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.7K
Paramagnetism01:30

Paramagnetism

3.3K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

32.0K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Updated: Apr 12, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Ferromagnetic ferroelectricity due to orbital ordering.

I V Solovyev1

  • 1Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 10, 2026
PubMed
Summary

Researchers designed ferromagnetic ferroelectricity by controlling orbital degrees of freedom. Antiferro orbital order breaks inversion symmetry, enabling simultaneous ferromagnetic and ferroelectric properties in materials like VI3.

Keywords:
Hund’s rulesferroelectricityferromagnetismorbital ordering

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Achieving ferromagnetic ferroelectricity, combining both orders in one phase, is a significant challenge.
  • Ferromagnetism alone does not break inversion symmetry, preventing its purely magnetic realization in some multiferroics.

Purpose of the Study:

  • To design a method for realizing ferromagnetic ferroelectricity by utilizing orbital degrees of freedom.
  • To establish fundamental principles for creating solids with coupled ferromagnetic and ferroelectric properties.

Main Methods:

  • Investigated the relationship between orbital order and magnetic interactions.
  • Formulated principles based on atomic arrangement, orbital flexibility, and electronic configurations.
  • Considered interatomic exchange coupling and intraatomic interactions (Hund's rule).

Main Results:

  • Demonstrated that antiferro orbital order can break inversion symmetry, leading to simultaneous ferromagnetic and ferroelectric behavior.
  • Identified key criteria for material design: non-centrosymmetric magnetic atoms, flexible orbitals, and specific electronic configurations (e.g., d^2).
  • Proposed van der Waals compound VI3 as a promising candidate material.

Conclusions:

  • Ferromagnetic ferroelectricity can be achieved by designing antiferro orbital order.
  • The principles outlined provide a roadmap for discovering new multiferroic materials.
  • VI3 is predicted to exhibit ferromagnetic ferroelectric properties, validating the proposed design strategy.