Topological magnon bands in a room temperature Kagome magnet

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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Cited by in corpus (25)

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• Quantum Interactions in Topological R166 Kagome Magnet
• Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals
• Topological magnetic excitations
• Manipulation of Dirac band curvature and momentum-dependent g-factor in a kagome magnet YMn6Sn6
• Unusual magnetic and transport properties in HoMn${}_6$Sn${}_6$ kagome magnet
• Magnon corner states in twisted bilayer honeycomb magnets
• Doping control of magnetism and emergent electromagnetic induction in high-temperature helimagnets
• New insight into tuning magnetic phases of $R$Mn${}_6$Sn${}_6$ kagome metals
• Effect of magnetism and phonons on localized carriers in the ferrimagnetic kagome metals GdMn${}_6$Sn${}_6$ and TbMn${}_6$Sn${}_6$
• Colossal orbital Zeeman effect driven by tunable spin-Berry curvature in a kagome metal
• Chiral and flat-band magnetic cluster excitations in a ferromagnetic kagome metal
• CrRhAs: a member of a large family of metallic kagome antiferromagnets
• High-field magnetic phase diagrams of the $\text{R}$Mn${}_6$Sn${}_6$ kagome metals
• Spin waves and orbital contribution to ferromagnetism in a topological metal
• Magnetoelectric control of spin helicity and nonreciprocal charge transport in a multiferroic metal
• Topological magnon in exchange frustration driven incommensurate spin spiral of a kagome lattice YMn${}_6$Sn${}_6$
• Quantifying magnetic field driven lattice distortions in kagome metals at the femto-scale using scanning tunneling microscopy
• Diverse Magnetic Phase Diagram and Anomalous Hall Effect in Antiferromagetic LuMn${}_6$Sn${}_6$
• Competing Lattice Instability and Magnetism on the Surface of Kagome Metals
• Effects of exchange distortions in the magnetic Kagome lattice
• Multiple topological corner states in the continuum of extended kagome lattice
• Multiple topological phases of magnons induced by Dzyaloshinskii-Moriya and pseudodipolar anisotropic exchange interactions in Kagome ferromagnets
• Topological excitations in quasi two-dimensional quantum magnets with weak interlayer interactions