Berry Curvature-Driven Anomalous Hall Effect in Polycrystalline Ferromagnet Fe₅Sn₃

Magnetic materials with broken time-reversal symmetry and large Berry curvature exhibit diverse transport responses due to the interplay of electronic structure and magnetism. This study reports a comprehensive investigation of the anomalous Hall effect (AHE) in ferromagnetic Fe5Sn3, conducted through experimental and theoretical approaches. Density functional theory calculations show that the intrinsic AHE originates from the substantial Berry curvature in the Bloch bands near the Fermi level, which is due to multiple band degeneracies. Polycrystalline Fe5Sn3, synthesized via a facile solid-state route, exhibits electrical transport properties comparable to single crystals. The Hall measurements indicate a substantial anomalous Hall conductivity (AHC) of 676 S/cm at 50 K, which agrees with the theoretical predictions. The intrinsic contribution, originating from the Berry curvature, accounts for 72% of the total AHC and predominates over extrinsic skew scattering. The observed skew scattering can be attributed to a secondary β-Sn phase in addition to the primary Fe5Sn3 phase. The large AHE observed in polycrystalline Fe5Sn3 opens promising opportunities for novel spintronic device applications, overcoming the scalability limitations of single crystals.