Topological Hall Effect Anisotropy in Kagome Bilayer Metal Fe_{3}Sn_{2}

Area of Science:

• Condensed Matter Physics
• Materials Science
• Solid State Physics

Background:

• Kagome lattice materials are recognized for unique topological properties and flat electronic bands.
• Iron tin (Fe_{3}Sn_{2}) exhibits a high-temperature noncollinear magnetic structure and hosts magnetic skyrmions.

Purpose of the Study:

• To comprehensively investigate the anisotropy and out-of-plane electric transport in Fe_{3}Sn_{2}.
• To understand the interplay between magnetic interactions, anisotropy, and topological phenomena in kagome lattice systems.

Main Methods:

• Electrical transport measurements were performed on micron-size Fe_{3}Sn_{2} crystals.
• Angular magnetoresistance was analyzed across different magnetic phases.

Main Results:

• A large topological Hall effect was observed along the c-axis over a broad temperature range, extending to the spin-glass state.
• Twofold and fourfold angular magnetoresistance patterns indicate competing magnetic interactions and anisotropy.
• Robust topological Hall effect was preserved for currents between kagome bilayers.

Conclusions:

• The findings provide new insights into the magnetic anisotropy of Fe_{3}Sn_{2}.
• The robust topological Hall effect highlights the potential of Fe_{3}Sn_{2} for skyrmionic-bubble device applications.