Subterahertz spin pumping from an insulating antiferromagnet

Abstract

Spin-transfer torque and spin Hall effects combined with their reciprocal phenomena, spin-pumping and inverse spin Hall (ISHE) effects, enable the reading and control of magnetic moments in spintronics. The direct observation of these effects remains elusive in antiferromagnetic-based devices. We report sub-terahertz spin-pumping at the interface of a uniaxial insulating antiferromagnet MnF2 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 sub-THz irradiation. Our results open the door to the controlled generation of coherent pure spin currents at THz frequencies.

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• The importance of the interface for picosecond spin pumping in antiferromagnet-heavy metal heterostructures
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• Laser patterning of magnonic structure via local crystallization of Yittrium Iron Garnet
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• Significant Unconventional Anomalous Hall Effect in Heavy Metal/Antiferromagnetic Insulator Heterostructures
• High quality epitaxial thin films and exchange bias of antiferromagnetic Dirac semimetal FeSn
• Spin-pumping in superconductor-antiferromagnetic insulator bilayers
• Terahertz high-harmonic generation in gapped antiferromagnetic chains
• Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators
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• Low-energy Properties of Electrons and Holes in CuFeS${}_2$
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• Spin Hall Effects in Antiferromagnets
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• Polar phonons and magnetic excitations in the antiferromagnet CoF${}_2$
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• Vector spin Seebeck effect and spin swapping effect in antiferromagnetic insulators with non-collinear spin structure
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