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Subterahertz spin pumping from an insulating antiferromagnet

Vaidya, Priyanka; Morley, Sophie A.; van Tol, Johan; Liu, Yan; Cheng, Ran; Brataas, Arne; Lederman, David; del Barco, Enrique
Peer reviewed, Journal article
Accepted version
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URI
https://hdl.handle.net/11250/2655188
Date
2020
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  • Institutt for fysikk [1805]
  • Publikasjoner fra CRIStin - NTNU [20734]
Original version
Science. 2020, 368 160-165.   10.1126/science.aaz4247
Abstract
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.
Publisher
American Association for the Advancement of Science
Journal
Science

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