Results for “Fe3Sn2” | Engineering Papers

DOE OSTI2020

Materials Data on Fe3Sn2 by Materials Project

Fe3Sn2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Fe is bonded in a 11-coordinate geometry to six equivalent Fe and five Sn atoms. There are a spread of Fe–Fe bond distances ranging from 2.55–2.78 Å. There are a spread of Fe–Sn bond distances ranging from 2.67–2.78 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a distorted q6 geometry to nine equivalent Fe atoms. In the second Sn site, Sn is bonded in a 9-coordinate geometry to six equivalent Fe atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2021

Isotropic nature of the metallic Kagome ferromagnet Fe 3 Sn 2 at high temperatures.

Anisotropy and competing exchange interactions have emerged as two central ingredients needed for centrosymmetric materials to exhibit topological spin textures. Fe 3 Sn 2 is thought to have these ingredients as well, as it has recently been discovered to host room temperature skyrmionic bubbles with an accompanying topological Hall effect. We present small-angle inelastic neutron scattering measurements that unambiguously show that Fe3Sn2 is an isotropic ferromagnet below TC ≈ 660 K to at least 480 K – the lower temperature threshold of our experimental configuration. Fe 3 Sn 2 is known to have competing magnetic exchange interactions, correlated electron behavior, weak magnetocrystalline anisotropy, and lattice anisotropy; all of these features are thought to play a role in stabilizing skyrmions in centrosymmetric systems. Our results reveal that at elevated temperatures, there is an absence of significant magnetocrystalline anisotropy and that the system behaves as a nearly ideal isotropic exchange interaction ferromagnet, with a spin stiffness D(T = 480 K) = 168 meV Å2, which extrapolates to a ground state spin stiffness D(T = 0 K) = 231 meV Å2.

36 MATERIALS SCIENCE↗