Spin waves and orbital contribution to ferromagnetism in a topological metal

Wenliang Zhang, Teguh Citra Asmara, Yi Tseng, Junbo Li, Yimin Xiong, Yuan Wei, Tianlun Yu, Carlos William Galdino, Zhijia Zhang, Kurt Kummer, Vladimir N. Strocov, Y. Soh (), Thorsten Schmitt () and Gabriel Aeppli
Additional contact information
Wenliang Zhang: Paul Scherrer Institut
Teguh Citra Asmara: Paul Scherrer Institut
Yi Tseng: Paul Scherrer Institut
Junbo Li: Chinese Academy of Sciences
Yimin Xiong: Anhui University
Yuan Wei: Paul Scherrer Institut
Tianlun Yu: Paul Scherrer Institut
Carlos William Galdino: Paul Scherrer Institut
Zhijia Zhang: Paul Scherrer Institut
Kurt Kummer: European Synchrotron Radiation Facility
Vladimir N. Strocov: Paul Scherrer Institut
Y. Soh: Paul Scherrer Institut
Thorsten Schmitt: Paul Scherrer Institut
Gabriel Aeppli: Paul Scherrer Institut

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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 exchange coupling that is larger than the already large in-plane couplings. The defining units of this topological metal are therefore triangular lattices of octahedral iron clusters rather than weakly coupled kagome planes. The spin waves are strongly damped when compared to elemental iron, opening the topic of topological boson–fermion interactions for deeper exploration within this material platform.

Date: 2024
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DOI: 10.1038/s41467-024-53152-1

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