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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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 one, the...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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...
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.
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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.
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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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Related Experiment Video

Updated: Jun 17, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

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Published on: December 3, 2013

Excitonic spin torque in a magnetic semiconductor.

Nicholas J Brennan1, Jiacheng Tang2, Jalil Varela-Manjarres3

  • 1Department of Physics, Cornell University, Ithaca, NY, USA.

Nature Materials
|June 15, 2026
PubMed
Summary
This summary is machine-generated.

Bound excitons in CrSBr act as a spin torque, enabling rapid switching of antiferromagnetic configurations with light. This intrinsic material property offers new possibilities for optospintronic devices and magnetic memory.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum optics

Background:

  • Excitons are fundamental electronic excitations in semiconductors, crucial for light-matter interactions.
  • They are key to phenomena in optoelectronics, nonlinear optics, and sensor technologies.

Purpose of the Study:

  • To investigate the role of excitons in magnetic semiconductors.
  • To demonstrate excitonic spin torque for controlling magnetic configurations.

Main Methods:

  • Utilizing the two-dimensional magnetic semiconductor CrSBr.
  • Observing the effects of a bound exciton reservoir on magnetic properties.

Main Results:

  • A bound exciton reservoir in CrSBr generates spin torques (both damping-like and anti-damping-like).
  • This excitonic spin torque drives magnetic switching between antiferromagnetic states using single optical pulses.
  • Excitonic spin torque is an intrinsic material property, independent of heterostructure design.

Conclusions:

  • Excitons can be practically controlled for optospintronic applications.
  • This work opens avenues for bidirectional quantum transducers, spintronic memory, and non-equilibrium magnetic phase transition studies.