Spin waves and orbital contribution to ferromagnetism in a topological metal.

ABSTRACT: Honeycomb and kagome lattices can host propagating excitations with non-trivial topology as defined by their evolution along closed paths in momentum space. Excitations on such lattices can also be momentum-independent, and the associated flat bands are of interest due to strong interactions between heavy quasiparticles. Here, we report the discovery - using circularly polarized X-rays for the unambiguous isolation of magnetic signals - of a nearly flat spin-wave band and large (compared to elemental iron) orbital moment in the metallic ferromagnet Fe₃Sn₂ with compact AB-stacked kagome bilayers. As a function of out-of-plane momentum, the nearly flat optical mode and the global rotation symmetry-restoring acoustic mode are out of phase, consistent with a bilayer excha

SUBMITTER: Zhang W 

PROVIDER: S-EPMC11484860 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature