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Spin-Torque-Driven Subterahertz Antiferromagnetic Resonance Dynamics.

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Physical Review Letters
|November 21, 2025
PubMed
Summary
This summary is machine-generated.

Spin torque antiferromagnetic resonance (ST-AFMR) was investigated in α-Fe_{2}O_{3}/Pt bilayers using optical terahertz pulses. Researchers observed a 280 GHz ST-AFMR mode, paving the way for ultrafast spintronic devices.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Spin torque antiferromagnetic resonance (ST-AFMR) is crucial for high-frequency spintronic devices like ultrafast magnetic storage and terahertz spin nano-oscillators.
  • Current ST-AFMR research is limited to gigahertz frequencies due to challenges in generating terahertz spin torques, restricting studies to low-frequency modes in easy-plane antiferromagnets.

Purpose of the Study:

  • To investigate ST-AFMR in the out-of-plane linearly polarized high-frequency mode of α-Fe_{2}O_{3}/Pt bilayers.
  • To explore the potential of optical terahertz pulses for exciting and detecting high-frequency antiferromagnetic dynamics.

Main Methods:

  • Utilized optical terahertz pulses as high-frequency excitation sources.
  • Employed time-resolved Faraday effect for detecting spin torque-driven magnetization dynamics.
  • Investigated α-Fe_{2}O_{3}/Pt bilayers to study the out-of-plane mode.

Main Results:

  • Observed ST-AFMR at a sub-terahertz frequency of 280 GHz.
  • Identified fieldlike spin-orbit torque as the dominant mechanism.
  • Net magnetization oscillations were in-plane, consistent with the high-frequency mode of easy-plane antiferromagnets.
  • Film thickness dependence confirmed an inherent origin of the high frequency, ruling out standing waves.
  • The ST-AFMR frequency showed high stability against external magnetic fields due to the absence of precession.

Conclusions:

  • The study successfully demonstrates ST-AFMR at a significant sub-terahertz frequency (280 GHz) in an out-of-plane mode.
  • Findings suggest that optical terahertz pulses are effective for exciting and detecting high-frequency antiferromagnetic dynamics.
  • This research opens new possibilities for developing ultrafast spintronic devices utilizing antiferromagnetic materials.