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Related Concept Videos

Diamagnetism01:26

Diamagnetism

2.4K
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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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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Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Paramagnetism01:30

Paramagnetism

2.5K
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...
2.5K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

293
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
293
Valence Bond Theory02:42

Valence Bond Theory

8.6K
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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Large off-diagonal magnetoelectricity in a triangular Co2+-based collinear antiferromagnet.

Xianghan Xu1, Yiqing Hao2, Shiyu Peng3

  • 1Department of Chemistry, Princeton University, Princeton, NJ, 08544, USA. xx8060@princeton.edu.

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|December 5, 2023
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Collinear spins in R-3 materials can exhibit magnetic toroidicity. Researchers observed this phenomenon in CoTe6O13, demonstrating its potential for novel magnetoelectric devices.

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Area of Science:

  • Solid-state physics
  • Materials science
  • Magnetism

Background:

  • Magnetic toroidicity is a rare magnetic structure in solids.
  • Understanding its origins is key for developing new functional materials.

Purpose of the Study:

  • To experimentally demonstrate magnetic toroidicity in a material with R-3 lattice symmetry.
  • To investigate the properties of CoTe6O13 for potential magnetoelectric applications.

Main Methods:

  • Single crystal X-ray diffraction
  • Temperature-dependent magnetic and thermodynamic measurements
  • Neutron diffraction
  • Symmetry analysis

Main Results:

  • A-type antiferromagnetic order was observed in CoTe6O13 below 19.5 K.
  • A large off-diagonal magnetoelectric coefficient (41.2 ps/m) confirmed magnetic toroidicity.
  • Significant orbital contribution to the magnetic moment was found.

Conclusions:

  • CoTe6O13 exhibits significant magnetic toroidicity due to collinear spins and R-3 symmetry.
  • This material shows promise for next-generation functional magnetoelectric devices.