2026-06-16 東京大学,高エネルギー加速器研究機構
図1：マグノンの強度およびカイラリティの測定結果と理論計算
(a) +5 mT後にHYSPECで測定したマグノンの強度と、(b) 対応する理論計算。(c) 測定したマグノンモードのカイラリティと、(d)対応する理論計算。赤色および青色の矢印は右回りマグノンΩ1 および左回りマグノンΩ2を示す。
＜関連情報＞
- https://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=31110
- https://journals.aps.org/prl/abstract/10.1103/m8lc-f8gk
オルターマグネットにおける切り替え可能なカイラルマグノンの観測 Observation of Switchable Chiral Magnons in an Altermagnet
Zheyuan Liu, Hodaka Kikuchi,, Zijun Wei, Shinichiro Asai, Mechthild Enderle, Ursula B. Hansen, Vasile O. Garlea, Manh D. Le, Gøran J. Nilsen et al.
Physical Review Letters Published: 12 June, 2026
DOI: https://doi.org/10.1103/m8lc-f8gk
Abstract
Chiral magnons, the quanta of handed spin waves, transport spin angular momentum without energy loss due to Joule heating. The recently discovered altermagnets were proposed to host chiral magnons arising from a nonrelativistic exchange mechanism, similar to that in ferromagnets but without net magnetization, offering a stray-field-free platform for efficient magnon spin-current manipulation. In this Letter, we directly observed chiral magnons in the altermagnetic prototype MnTe using polarized inelastic neutron scattering. Furthermore, the magnon chirality was found to be reversibly switched by magnetic-field control, establishing a robust foundation for functional altermagnetic magnonics.
