Topological Hall Effect Anisotropy in Kagome Bilayer Metal Fe3Sn2

Kagome lattice materials have attracted growing interest for their topological properties and flatbands in electronic structure. We present a comprehensive study on the anisotropy and out-of-plane electric transport in Fe3Sn2, a metal with bilayer of Fe kagome planes and with massive Dirac fermions that features high-temperature noncollinear magnetic structure and magnetic skyrmions. For the electrical current path along the c axis, in micron-size crystals, we found a large topological Hall effect over a wide temperature range down to spin-glass state. Twofold and fourfold angular magnetoresistance are observed for different magnetic phases, reflecting the competition of magnetic interactions and magnetic anisotropy in kagome lattice that preserve robust topological Hall effect for inter-kagome bilayer currents. This provides new insight into the anisotropy in Fe3Sn2, of interest in skyrmionic-bubble application-related micron-size devices.

Automated summary

This study presents a comprehensive investigation on the anisotropy and out-of-plane electric transport in Fe3Sn2, a Kagome lattice material. The research reveals the presence of a large topological Hall effect along the c axis and the observation of angular magnetoresistance under different magnetic phases.