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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Diamagnetism01:26

Diamagnetism

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.
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Ferromagnetism01:31

Ferromagnetism

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...
Paramagnetism01:30

Paramagnetism

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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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Nonlinear Optomagnetic Signature of d-Wave Altermagnets.

Lijun Yang1, Long Liang1

  • 1Sichuan Normal University, Department of Physics, Institute of Solid State Physics and Center for Computational Sciences, Chengdu, Sichuan 610066, China.

Physical Review Letters
|June 22, 2026
PubMed
Summary
This summary is machine-generated.

Altermagnetism research explores d-wave materials using the inverse Cotton-Mouton effect. This effect induces magnetization with light, revealing material symmetry and enabling detection.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Optomagnetism

Background:

  • Altermagnetism is a novel collinear magnetic order characterized by zero net magnetization and spin-split bands.
  • It presents significant fundamental physics and potential technological applications, driving research interest.
  • Understanding the optomagnetic response is crucial for harnessing altermagnetic properties.

Purpose of the Study:

  • To investigate the optomagnetic response in d-wave altermagnets.
  • To focus on the inverse Cotton-Mouton effect for inducing magnetization with polarized light.
  • To explore the potential of this effect for detecting and probing d-wave altermagnets.

Main Methods:

  • Theoretical investigation of the inverse Cotton-Mouton effect in d-wave altermagnets.
  • Analysis of the relationship between induced magnetization and light polarization.
  • Examination of the role of the Néel vector and system symmetry.

Main Results:

  • The direction of light-induced magnetization is dictated by the Néel vector.
  • The magnitude of induced magnetization shows a periodic dependency on the light's polarization angle.
  • This periodic behavior is a direct consequence of the material's intrinsic symmetry.

Conclusions:

  • The inverse Cotton-Mouton effect provides a direct pathway for detecting d-wave altermagnets.
  • This optomagnetic effect serves as a sensitive probe for the intrinsic properties of these materials.
  • Findings highlight a new method for characterizing novel magnetic orders.