Handedness manipulation of propagating antiferromagnetic magnons

Yoichi Shiota (), Tomohiro Taniguchi, Daiju Hayashi, Hideki Narita, Shutaro Karube, Ryusuke Hisatomi, Takahiro Moriyama and Teruo Ono
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Yoichi Shiota: Kyoto University
Tomohiro Taniguchi: Research Center for Emerging Computing Technologies
Daiju Hayashi: Kyoto University
Hideki Narita: Kyoto University
Shutaro Karube: Kyoto University
Ryusuke Hisatomi: Kyoto University
Takahiro Moriyama: Nagoya University
Teruo Ono: Kyoto University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Antiferromagnetic magnons possess a distinctive feature absent in their ferromagnetic counterparts: the presence of two distinct handedness modes, the right-handed (RH) and left-handed (LH) precession modes. The magnon handedness determines the sign of spin polarization carried by the propagating magnon, which is indispensable for harnessing the diverse functionalities in magnonic devices, such as data encoding, magnon polarization-based logic systems, and quantum applications involving magnons. However, the control of coherently propagating magnon handedness in antiferromagnets has remained elusive. Here we demonstrate the manipulation and electrical readout of propagating magnon handedness in perpendicularly magnetized synthetic antiferromagnets (SAF). We find that the antiferromagnetic magnon handedness can be directly identified by measuring the inverse spin Hall effect (ISHE) voltage, which arises from the spin pumping effect caused by the propagating antiferromagnetic magnons in the SAF structure. The RH and LH modes of the magnon can be distinguishable when the SAF structure is sandwiched by heavy metals with the same sign of spin Hall angle. This work unveils promising avenues for harnessing the unique properties of antiferromagnetic magnons.

Date: 2024
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DOI: 10.1038/s41467-024-54125-0

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