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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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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.
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Color in Coordination Complexes
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X-Ray Magnetic Circular Dichroism in Altermagnetic α-MnTe.

A Hariki1, A Dal Din2, O J Amin2

  • 1Department of Physics and Electronics, Graduate School of Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan.

Physical Review Letters
|May 10, 2024
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Altermagnetism, a new magnetic state, exhibits unique X-ray Magnetic Circular Dichroism (XMCD) properties. This study reveals a distinct XMCD signature in α-MnTe, paving the way for advanced magnetic spectroscopy.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Altermagnetism is a novel magnetic symmetry class merging ferromagnet and antiferromagnet characteristics.
  • This class offers unique phenomena not seen in traditional magnetic materials.
  • X-ray Magnetic Circular Dichroism (XMCD) is a powerful spectroscopic technique for probing magnetism.

Purpose of the Study:

  • To explore and characterize X-ray Magnetic Circular Dichroism (XMCD) in altermagnetic materials.
  • To investigate the XMCD response in α-MnTe, a representative altermagnet.
  • To identify and confirm a unique XMCD line shape in altermagnets.

Main Methods:

  • Symmetry analysis
  • Ab initio theory calculations
  • Experimental X-ray Magnetic Circular Dichroism (XMCD) spectroscopy
  • Utilized α-MnTe with compensated antiparallel magnetic order

Main Results:

  • Predicted and experimentally confirmed a characteristic XMCD line shape for in-plane magnetic moments in altermagnets.
  • Demonstrated a distinct time-reversal symmetry breaking response in altermagnets.
  • Observed XMCD signatures in α-MnTe that differ from conventional ferromagnets and antiferromagnets.

Conclusions:

  • Altermagnets possess unique XMCD properties distinct from conventional magnetic classes.
  • The identified XMCD line shape provides a signature for altermagnetic materials.
  • Altermagnetic XMCD holds potential for element-specific spectroscopy and microscopy applications.