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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.3K
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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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...
8.3K
Paramagnetism01:30

Paramagnetism

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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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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...
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Diamagnetism01:26

Diamagnetism

2.3K
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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Metallic Solids02:37

Metallic Solids

18.0K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Stacking-Engineered Ferroelectricity and Multiferroic Order in van der Waals Magnets.

Daniel Bennett1, Gabriel Martínez-Carracedo2,3, Xu He4

  • 1John A. Paulson School of Engineering and Applied Sciences, <a href="https://ror.org/03vek6s52">Harvard University</a>, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|January 3, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a universal method to create multiferroic 2D materials from van der Waals magnets. By altering layer stacking, they achieved ferroelectricity and magnetoelectric coupling in bilayer NiI2, paving the way for novel nanoscale devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials with ferroic properties (ferromagnetism, ferroelectricity, ferroelasticity) are key for advanced nanotechnology.
  • Achieving multiferroic order, which combines multiple ferroic properties, is challenging due to complex electron and spin interactions.

Purpose of the Study:

  • To propose a universal strategy for engineering multiferroic 2D materials.
  • To demonstrate this strategy using van der Waals magnets and first-principles calculations.
  • To discover novel magnetoelectric coupling mechanisms in engineered 2D systems.

Main Methods:

  • Utilizing van der Waals magnets and manipulating layer stacking to break inversion symmetry.
  • Employing first-principles calculations to investigate bilayer Nickel Iodide (NiI2).
  • Analyzing the relationship between interlayer spin order and interfacial electronic polarization.

Main Results:

  • Demonstrated that rotating adjacent layers in bilayer NiI2 by 180° induces ferroelectricity.
  • Discovered a strong magnetoelectric coupling between interlayer spin order and interfacial polarization.
  • Validated a general and systematic approach for designing 2D multiferroics.

Conclusions:

  • The proposed stacking-engineering method offers a viable route to realize 2D multiferroics.
  • This approach facilitates the discovery of novel 2D materials with significant magnetoelectric coupling.
  • The findings hold promise for the development of multifunctional nanoscale electronic devices.