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Related Concept Videos

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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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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Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

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Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.5K
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...
2.5K
Diamagnetism01:26

Diamagnetism

3.1K
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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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Temperature dependent electron paramagnetic resonance study on magnetoelectric YCrO3.

Ashish Kumar Mall1, Ambesh Dixit2, Ashish Garg3

  • 1Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur 208016, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 18, 2017
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Electron paramagnetic resonance (EPR) studies reveal short-range magnetic correlations in Yttrium Chromium Oxide (YCrO3) above its Néel temperature. This suggests potential for high-temperature magnetoelectric applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Yttrium Chromium Oxide (YCrO3) is a material exhibiting complex magnetic properties.
  • Understanding spin dynamics in the paramagnetic region is crucial for its technological applications.

Purpose of the Study:

  • To investigate the spin dynamics of polycrystalline YCrO3 using temperature-dependent electron paramagnetic resonance (EPR).
  • To identify phase transitions and magnetic correlations within the paramagnetic state.
  • To explore the potential for magnetodielectric coupling in YCrO3.

Main Methods:

  • Polycrystalline YCrO3 samples were studied using X-band electron paramagnetic resonance (EPR) from 120 K to 298 K.
  • EPR spectra parameters (line width, integrated intensity, g-factor) were analyzed as a function of temperature.
  • Temperature-dependent dielectric measurements were performed.

Main Results:

  • EPR spectra showed a single broad line attributed to Cr3+ ions across the temperature range.
  • A peak in the g-factor at approximately 230 K indicated a new phase, linked to short-range canted antiferromagnetic correlations.
  • EPR intensity increased with decreasing temperature up to the Néel temperature (TN), due to magnetic moment renormalization.
  • Dielectric measurements revealed an anomaly at ~230 K, suggesting magnetodielectric coupling.

Conclusions:

  • Short-range canted antiferromagnetic correlations emerge in YCrO3 well above TN, influencing its magnetic behavior.
  • The observed magnetodielectric coupling at ~230 K highlights YCrO3 as a potential candidate for high-temperature magnetoelectric devices.