The magnetic property and anomalous Hall effect of polycrystalline Fe3Sn

The structure, magnetic and transport properties of hexagonal D0₁₉ phase of Fe₃Sn polycrystal has been studied in this paper. It is shown that a small amount of Fe₃Sn₂ is produced in our Fe₃Sn polycrystalline sample. The experimentally determined spontaneous moment of Fe₃Sn is 7.01 μ_B/f.u. The longitudinal electrical resistivity is dominated by electron-electron and electron-magnon scattering at temperatures below 80 K and electron-phonon scattering dominates the transport above 80 K. The anomalous Hall conductivity (AHC) is determined to be 160.35 Ω⁻¹ cm⁻¹ and 143.77 Ω⁻¹ cm⁻¹ at 5 K and 300 K, respectively. An intrinsic AHC of 95.8 Ω⁻¹ cm⁻¹ is derived by fitting the experimental results, which is about 59.74 % of the total value of the AHC at 5 K, suggesting that the AHC is mainly attributed to the intrinsic Berry curvature contribution. A significant skew scattering contribution of 64.55 Ω⁻¹ cm⁻¹ from impurities and phonons is also present. Theoretical calculations demonstrate that the band structure appears a linear crossing along the M-Γ path near the Fermi level (E_F), which is gapped by spin-orbit coupling (SOC), resulting in a large Berry curvature and a corresponding large theoretical intrinsic AHC of 735.14 Ω⁻¹ cm⁻¹ at the E_F. The large discrepancy between the experimental and theoretical results is attributed to the presence of the secondary Fe₃Sn₂ phase.