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Subterahertz spin pumping from an insulating antiferromagnet.

Priyanka Vaidya1, Sophie A Morley2, Johan van Tol3

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Researchers observed subterahertz spin pumping in an antiferromagnet-insulator interface. The inverse spin Hall effect voltage depended on the excitation

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Antiferromagnetism

Background:

  • Spin-transfer torque and spin Hall effects are key spintronic phenomena.
  • Direct observation of these effects in antiferromagnetic devices is challenging.

Purpose of the Study:

  • To investigate spin pumping and inverse spin Hall effects (ISHEs) at an antiferromagnet-insulator interface.
  • To explore the control of spin currents using circularly polarized irradiation.

Main Methods:

  • Utilized subterahertz spin pumping at the interface of manganese difluoride (an antiferromagnet) and platinum.
  • Measured the ISHE voltage generated by spin-charge conversion in platinum.
  • Employed circularly polarized subterahertz irradiation to excite and modulate antiferromagnetic dynamical modes.

Main Results:

  • Successfully observed subterahertz spin pumping at the MnF2/Pt interface.
  • Demonstrated that the measured ISHE voltage is dependent on the chirality of the antiferromagnetic dynamical modes.
  • Showcased selective excitation and modulation of these modes by the handedness of the irradiation.

Conclusions:

  • This work provides direct evidence of spin pumping in an insulating antiferromagnet.
  • The results highlight the potential for controlling pure spin currents at terahertz frequencies.
  • Opens avenues for novel spintronic applications utilizing antiferromagnetic dynamics.