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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Diamagnetism01:26

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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

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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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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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Crystal Field Theory - Octahedral Complexes02:58

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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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Forced-ferromagnetic state in a Tm2Fe17H5 single crystal.

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Summary

Researchers achieved a ferromagnetic state in a hydrogen-modified thulium-iron compound. This heavy rare-earth intermetallic material exhibits high magnetic polarization under a strong external magnetic field.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • Rare-earth iron intermetallic compounds (RE₂Fe₁₇) are known for their magnetic properties.
  • Interstitial modification, such as hydrogenation, can significantly alter these properties.
  • Thulium-iron (Tm-Fe) compounds are particularly sensitive to external magnetic fields.

Purpose of the Study:

  • To investigate the ferromagnetic properties of hydrogen-modified Tm₂Fe₁₇.
  • To determine the magnetic polarization achievable in Tm₂Fe₁₇H₅ under a high magnetic field.
  • To explore the potential of interstitial modification for enhancing magnetic states in rare-earth intermetallics.

Main Methods:

  • Synthesis of a single crystal Tm₂Fe₁₇.
  • Interstitial hydrogen insertion to achieve Tm₂Fe₁₇H₅ (5 at.H/f.u.).
  • Application of a high external magnetic field (57 T) to induce and measure the magnetic state.

Main Results:

  • The hydrogen-modified Tm₂Fe₁₇H₅ compound successfully attained a ferromagnetic state.
  • A high magnetic polarization of 2.25 T was recorded.
  • The study demonstrates the effectiveness of interstitial hydrogenation in tuning magnetic properties.

Conclusions:

  • Interstitial hydrogen modification can induce a ferromagnetic state in heavy rare-earth-iron intermetallics.
  • Tm₂Fe₁₇H₅ exhibits significant magnetic polarization under high magnetic fields.
  • This research opens avenues for developing advanced magnetic materials through controlled interstitial doping.