Topological magnon bands in a room-Temperature kagome magnet

H. Zhang; X. Feng; T. Heitmann; A. I. Kolesnikov; M. B. Stone; Y. M. Lu; X. Ke

doi:10.1103/PhysRevB.101.100405

Topological magnon bands in a room-Temperature kagome magnet

H. Zhang, X. Feng, T. Heitmann, A. I. Kolesnikov, M. B. Stone, Y. M. Lu, X. Ke

Direct Geometry

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40 Scopus citations

Abstract

Topological magnon is a vibrant research field gaining more and more attention in the past few years. Among many theoretical proposals and limited experimental studies, ferromagnetic kagome lattice emerges as one of the most elucidating systems. Here we report neutron scattering studies of YMn6Sn6, a metallic system consisting of ferromagnetic kagome planes. This system undergoes a commensurate-To-incommensurate antiferromagnetic phase transition upon cooling with the incommensurability along the out-of-plane direction. We observe magnon band gap opening at the symmetry-protected K points and ascribe this feature to the antisymmetric Dzyaloshinskii-Moriya (DM) interactions. Our observation supports the existence of topological Dirac magnons in both the commensurate collinear and incommensurate coplanar magnetic orders, which is further corroborated by symmetry analysis. This finding places YMn6Sn6 as a promising candidate for room-Temperature magnon spintronics applications.

Original language	English
Article number	100405
Journal	Physical Review B
Volume	101
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.101.100405
State	Published - Mar 1 2020

Bibliographical note

Publisher Copyright:
© 2020 American Physical Society.

Funding

The work at Michigan State University was supported by the National Science Foundation (NSF) under Award No. DMR-1608752. The work at Ohio State University was supported by the NSF under Award No. DMR-1653769. A portion of this research used resources at the Spallation Neutron Source, a Department of Energy (DOE) Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
National Science Foundation	DMR-1653769, 1653769, DMR-1608752
U.S. Department of Energy
Office of Science
Oak Ridge National Laboratory

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10.1103/PhysRevB.101.100405

Cite this

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abstract = "Topological magnon is a vibrant research field gaining more and more attention in the past few years. Among many theoretical proposals and limited experimental studies, ferromagnetic kagome lattice emerges as one of the most elucidating systems. Here we report neutron scattering studies of YMn6Sn6, a metallic system consisting of ferromagnetic kagome planes. This system undergoes a commensurate-To-incommensurate antiferromagnetic phase transition upon cooling with the incommensurability along the out-of-plane direction. We observe magnon band gap opening at the symmetry-protected K points and ascribe this feature to the antisymmetric Dzyaloshinskii-Moriya (DM) interactions. Our observation supports the existence of topological Dirac magnons in both the commensurate collinear and incommensurate coplanar magnetic orders, which is further corroborated by symmetry analysis. This finding places YMn6Sn6 as a promising candidate for room-Temperature magnon spintronics applications.",

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AU - Stone, M. B.

AU - Lu, Y. M.

AU - Ke, X.

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AB - Topological magnon is a vibrant research field gaining more and more attention in the past few years. Among many theoretical proposals and limited experimental studies, ferromagnetic kagome lattice emerges as one of the most elucidating systems. Here we report neutron scattering studies of YMn6Sn6, a metallic system consisting of ferromagnetic kagome planes. This system undergoes a commensurate-To-incommensurate antiferromagnetic phase transition upon cooling with the incommensurability along the out-of-plane direction. We observe magnon band gap opening at the symmetry-protected K points and ascribe this feature to the antisymmetric Dzyaloshinskii-Moriya (DM) interactions. Our observation supports the existence of topological Dirac magnons in both the commensurate collinear and incommensurate coplanar magnetic orders, which is further corroborated by symmetry analysis. This finding places YMn6Sn6 as a promising candidate for room-Temperature magnon spintronics applications.

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Topological magnon bands in a room-Temperature kagome magnet

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