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Researchers achieved terahertz (THz) oscillations in antiferromagnetic materials using optical spin-orbit torque. This breakthrough paves the way for novel nano-scale oscillators operating at THz frequencies.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Antiferromagnets offer potential for nano-scale oscillators across gigahertz to terahertz frequencies.
  • Experimental realization of antiferromagnetic oscillation via spin-orbit torque remains a significant challenge.

Purpose of the Study:

  • To demonstrate the experimental realization of antiferromagnetic oscillations using optical spin-orbit torque.
  • To investigate the THz frequency oscillations in metallic antiferromagnetic Mn2Au thin films.

Main Methods:

  • Utilizing circularly polarized laser to induce optical spin-orbit torque.
  • Employing spin-to-charge conversion in Mn2Au due to local inversion symmetry breaking.
  • Detecting ultrafast alternating current (a.c.) through free-space terahertz emission.
  • Conducting antiferromagnetic moments switching experiments and dynamics analyses.

Main Results:

  • Achieved free-decaying oscillations at 2 THz in Mn2Au thin films driven by optical spin-orbit torque.
  • Demonstrated that driven antiferromagnetic moments oscillate back to equilibrium within 5 ps after torque removal.
  • Observed ultrafast a.c. current generation via spin-to-charge conversion.

Conclusions:

  • Optical spin-orbit torque can effectively drive antiferromagnetic moment oscillations.
  • This work establishes a new pathway for developing low-dissipation, controllable antiferromagnet-based spin-torque oscillators.
  • The findings hold fundamental significance for spintronic device applications.