Magnetodynamic properties of ultrathin films of Fe[Formula: see text]Sn[Formula: see text]-a topological kagome ferromagnet.

ABSTRACT

Fe[Formula see text]Sn[Formula see text] is a topological kagome ferromagnet that possesses numerous Weyl points close to the Fermi energy, which can manifest various unique transport phenomena such as chiral anomaly, anomalous Hall effect, and giant magnetoresistance. However, the magnetodynamic properties of Fe[Formula see text]Sn[Formula see text] have not yet been explored. Here, we report, for the first time, the measurements of the intrinsic Gilbert damping constant ([Formula see text]), and the effective spin mixing conductance (g[Formula see text]) of Pt/Fe[Formula see text]Sn[Formula see text] bilayers for Fe[Formula see text]Sn[Formula see text] thicknesses down to 2 nm, for which [Formula see text] is [Formula see text], and g[Formula see text] is [Formula see text]. The films have a high saturation magnetization, [Formula see text], and large anomalous Hall coefficient, [Formula see text]. The large values of g[Formula see text], together with the topological properties of Fe[Formula see text]Sn[Formula see text], make Fe[Formula see text]Sn[Formula see text]/Pt bilayers useful heterostructures for the study of topological spintronic devices.