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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.5K
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

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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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.2K
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...
1.2K
Paramagnetism01:30

Paramagnetism

2.6K
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...
2.6K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

1.8K
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...
1.8K
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

3.2K
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
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Updated: Sep 19, 2025

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Spin-Polarized Antiferromagnets for Spintronics.

Zhenzhou Guo1, Xiaotian Wang1, Wenhong Wang2

  • 1Institute for Superconducting and Electronic Materials, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, New South Wales, 2500, Australia.

Advanced Materials (Deerfield Beach, Fla.)
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Spin-polarized antiferromagnets offer unique properties for advanced spintronics. This review explores their symmetry, topology, and transport, highlighting challenges and opportunities for future technologies.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Technologies

Background:

  • Spin-polarized antiferromagnets (AFMs) are emerging as key materials for next-generation spintronics and optoelectronics.
  • These materials combine spin-polarized states with zero net magnetization, enabling ultrafast dynamics and field robustness.

Purpose of the Study:

  • To systematically review the fundamental principles governing spin-polarized antiferromagnets.
  • To synthesize recent theoretical and experimental breakthroughs in this field.
  • To identify challenges and future pathways for harnessing AFMs.

Main Methods:

  • Review of fundamental principles linking symmetry, band topology, and transport properties.
  • Synthesis of recent theoretical advancements.
  • Compilation of experimental findings across various AFM classes.

Main Results:

  • AFMs exhibit emergent phenomena like nonrelativistic spin-momentum locking and anomalous transport.
  • Symmetry-breaking mechanisms dictate unique electronic and magnetic properties.
  • Gate-tunable magneto-optical responses and spin-polarized currents are observed.

Conclusions:

  • AFMs present transformative potential for ultra-low-power memory and spin-logic architectures.
  • Challenges include achieving room-temperature functionality and scalable Néel vector control.
  • Further research can unlock applications in quantum information technologies.