Subterahertz spin pumping from an insulating antiferromagnet
Spin-transfer torque and spin Hall effects combined with their reciprocal phenomena, spin pumping and inverse spin Hall effects (ISHEs), enable the reading and control of magnetic moments in spintronics. The direct observation of these effects remains elusive in antiferromagnetic-based devices. We report subterahertz spin pumping at the interface of the uniaxial insulating antiferromagnet manganese difluoride and platinum. The measured ISHE voltage arising from spin-charge conversion in the platinum layer depends on the chirality of the dynamical modes of the antiferromagnet, which is selectively excited and modulated by the handedness of the circularly polarized subterahertz irradiation. Our results open the door to the controlled generation of coherent, pure spin currents at terahertz frequencies.
- Pub Date:
- April 2020
- MAT SCI; PHYSICS;
- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics
- Science , Vol. 368, Apr 10 2020, Issue 6487, pp. 160-165