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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

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Magnetic Tweezers for the Measurement of Twist and Torque
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Harnessing Magnetic Octupole Hall Effect to Induce Torque in Altermagnets.

Seungyun Han1, Daegeun Jo2,3, Insu Baek1

  • 1Pohang University of Science and Technology, Department of Physics, Pohang 37673, Korea.

Physical Review Letters
|September 10, 2025
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Summary

d-wave altermagnets utilize magnetic octupoles. External magnetic octupole injection generates torque, enabling electrical control of altermagnet configurations via the magnetic octupole Hall effect.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • d-wave altermagnets exhibit magnetic octupoles as their primary order parameters.
  • The manipulation of magnetic states in materials is crucial for technological advancements.

Purpose of the Study:

  • To theoretically investigate the generation of torque in d-wave altermagnets via external magnetic octupole injection.
  • To explore the potential of the magnetic octupole Hall effect for controlling altermagnet configurations.

Main Methods:

  • Theoretical modeling of magnetic octupole dynamics and interactions.
  • Calculation of the magnetic octupole Hall conductivity in heavy metals like alpha-tungsten.
  • Analysis of torque generation mechanisms in d-wave altermagnets.

Main Results:

  • External magnetic octupoles injected into d-wave altermagnets induce a significant torque.
  • The magnetic octupole Hall conductivity of alpha-tungsten is calculated to be substantial.
  • The calculated conductivity is comparable to the spin Hall conductivity of heavy metals.

Conclusions:

  • The study establishes a magnetic octupole Hall phenomenology analogous to the spin Hall effect.
  • This phenomenon allows for electrical control of magnetic configurations in d-wave altermagnets.
  • The findings open new avenues for spintronic devices utilizing altermagnets.