Low-Temperature Competing Magnetic Energy Scales in the Topological Ferrimagnet ${\mathrm{TbMn}}_{6}{\mathrm{Sn}}_{6}$

Newly discovered magneticinteractions could lead to novel ways to manipulate electron flow Ames_Laboratory PhysRevX

is a metallic ferrimagnet displaying signatures of both topological electrons and topological magnons arising from ferromagnetism and spin-orbit coupling within its Mn kagome layers. Inelastic neutron scattering measurements find strong ferromagnetic interactions within the Mn kagome layer and reveal a magnetic bandwidth of.

The low-energy magnetic excitations are characterized by strong FM Mn-Mn and antiferromagnetic Mn-Tb interlayer magnetic couplings. We observe weaker, competing long-range FM and AFM Mn-Mn interlayer interactions similar to those driving helical magnetism in thesystem. Combined with density-functional theory calculations, we find that competing Mn-Mn interlayer magnetic interactions occur in all

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