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Related Concept Videos

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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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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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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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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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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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 Tweezers for the Measurement of Twist and Torque
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Spin-orbit-torque based on Mn-based noncollinear antiferromagnets.

Shiwei Chen1, Dequan Meng1, Guang Zeng1

  • 1School of Physics, Hubei University, Wuhan 430062, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 27, 2025
PubMed
Summary

Mn-based non-collinear antiferromagnets show promise for advanced spintronic devices. Their unique properties enable efficient spin-orbit torque switching for faster, denser data storage solutions.

Keywords:
noncollinear antiferromagnetsspintronicsspin–orbit-torqueunconventional spin polarization

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Area of Science:

  • Spintronics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Increasing data volumes necessitate faster and denser spintronic devices.
  • Non-collinear antiferromagnets offer unique properties like minimal stray fields and rapid dynamics.

Purpose of the Study:

  • To review the application of Mn-based non-collinear antiferromagnets in spintronic devices.
  • To explore their use as spin source and magnetic layers.

Main Methods:

  • Review of crystal and magnetic structures.
  • Analysis of charge and spin transport properties.
  • Examination of spin-orbit torque (SOT) driven magnetization switching.

Main Results:

  • Demonstration of all-electrical SOT-driven perpendicular magnetization switching using these materials as spin sources.
  • Observation of deterministic switching of antiferromagnetic order and potential for self-induced switching when used as magnetic layers.

Conclusions:

  • Mn-based non-collinear antiferromagnets are effective for SOT switching in spintronics.
  • Future research should focus on further optimizing these materials for next-generation devices.