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Diamagnetism01:26

Diamagnetism

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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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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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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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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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Magnetic moment collapse induced axial alternative compressibility of Cr<sub>2</sub>TiAlC<sub>2</sub> at 420 GPa from first principle.

Scientific reports·2016
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Pressure-induced magnetic moment abnormal increase in Mn2FeAl and non-continuing decrease in Fe2MnAl via first

Yang Ze-Jin1,2, Gao Qing-He3,4, Xiong Heng-Na5

  • 1School of Science, Zhejiang University of Technology, Hangzhou, 310023, China. zejinyang@zjut.edu.cn.

Scientific Reports
|November 30, 2017
PubMed
Summary
This summary is machine-generated.

The magnetism of Fe2MnAl and Mn2FeAl compounds changes uniquely under pressure, with magnetic moments collapsing at different pressures. Half-metallicity is maintained at lower pressures.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational materials science

Background:

  • Magnetism in Heusler compounds is crucial for spintronic applications.
  • Understanding pressure-induced magnetic transitions is key to material design.

Purpose of the Study:

  • Investigate the pressure-dependent magnetism of Fe2MnAl and Mn2FeAl using first-principles calculations.
  • Analyze the evolution of magnetic moments and half-metallicity under varying pressures.

Main Methods:

  • First-principles calculations were employed to study Fe2MnAl and Mn2FeAl.
  • Magnetic moments, charge transfer, and bond populations were analyzed under pressure.

Main Results:

  • Fe2MnAl exhibits three distinct magnetic moment slopes under pressure, collapsing at 450 GPa.
  • Mn2FeAl shows an initial increase in magnetic moment before collapsing at 175 GPa.
  • Half-metallicity is preserved up to 100 GPa (Fe2MnAl) and 50 GPa (Mn2FeAl).
  • Elastic softening in Fe2MnAl observed at 270 GPa during the second magnetic moment collapse.

Conclusions:

  • The distinct magnetic behaviors are linked to charge transfer and bond population rearrangements.
  • Pressure-induced magnetic collapse does not cause significant volume or bond length anomalies.
  • Elastic anomalies in Fe2MnAl indicate complex responses to magnetic transitions.