Spin-orbit torque manipulation of sub-terahertz magnons in antiferromagnetic α-Fe2O3

Dongsheng Yang, Taeheon Kim, Kyusup Lee, Chang Xu, Yakun Liu, Fei Wang, Shishun Zhao, Dushyant Kumar and Hyunsoo Yang ()
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Dongsheng Yang: National University of Singapore
Taeheon Kim: National University of Singapore
Kyusup Lee: National University of Singapore
Chang Xu: National University of Singapore
Yakun Liu: National University of Singapore
Fei Wang: National University of Singapore
Shishun Zhao: National University of Singapore
Dushyant Kumar: National University of Singapore
Hyunsoo Yang: National University of Singapore

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The ability to electrically manipulate antiferromagnetic magnons, essential for extending the operating speed of spintronic devices into the terahertz regime, remains a major challenge. This is because antiferromagnetic magnetism is challenging to perturb using traditional methods such as magnetic fields. Recent developments in spin-orbit torques have opened a possibility of accessing antiferromagnetic magnetic order parameters and controlling terahertz magnons, which has not been experimentally realised yet. Here, we demonstrate the electrical manipulation of sub-terahertz magnons in the α-Fe2O3/Pt antiferromagnetic heterostructure. By applying the spin-orbit torques in the heterostructure, we can modify the magnon dispersion and decrease the magnon frequency in α-Fe2O3, as detected by time-resolved magneto-optical techniques. We have found that optimal tuning occurs when the Néel vector is perpendicular to the injected spin polarisation. Our results represent a significant step towards the development of electrically tunable terahertz spintronic devices.

Date: 2024
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DOI: 10.1038/s41467-024-48431-w

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