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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Ferrocement01:30

Ferrocement

Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
Diamagnetism01:26

Diamagnetism

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.
Valence Bond Theory02:42

Valence Bond Theory

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...
Paramagnetism01:30

Paramagnetism

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...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Framework-structured weak ferromagnets.

Dan-Feng Weng1, Zhe-Ming Wang, Song Gao

  • 1Beijing National Laboratory of Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.

Chemical Society Reviews
|February 2, 2011
PubMed
Summary
This summary is machine-generated.

Framework-structured weak ferromagnets, utilizing spin canting, offer promising molecule-based magnetic materials. This review highlights structural features, ligand design, and strategies for achieving desired magnetic properties.

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Framework-structured materials are emerging as key players in molecule-based magnetism.
  • Spin canting provides an effective route to weak ferromagnetism in these materials.

Purpose of the Study:

  • To provide a comprehensive overview of framework-structured weak ferromagnets.
  • To emphasize the structure-property relationships and ligand design strategies.

Main Methods:

  • Critical review of existing literature.
  • Analysis of various ligand types (mono-atom to three-atom-like).
  • Focus on spin canting mechanisms and their impact on magnetic properties.

Main Results:

  • Framework structures facilitate long-range spin ordering.
  • Weak ferromagnetism is achievable through spin canting with sufficient canting angles.
  • Ligand choice significantly influences magnetic properties.

Conclusions:

  • Framework-structured weak ferromagnets represent a promising class of molecule-based magnets.
  • Rational design of ligands and understanding structural features are crucial for developing materials with desired magnetic properties and applications.