Research

mperature anomalous and topological Hall responses in the epitaxial ferromagnetic Weyl nodal-line metal F⁡e5⁢S⁢i3- By Prof. Sujeet Chaudhary

The interplay between real and reciprocal space topology yields intrinsically linked transport phenomena in topological magnetic material systems. In particular, broken time-reversal symmetry together with strong Dzyaloshinskii-Moriya interaction and pronounced uniaxial anisotropy can simultaneously stabilize momentum-space Berry-curvature singularities (Weyl nodes) and real-space chiral spin textures. The concurrent realization of these dual topological features remains exceptionally rare, particularly in epitaxial thin films. Here, we present a combined first-principles and detailed magnetotransport investigation of epitaxial F⁡e5⁢S⁢i3 thin films, establishing the material as a magnetic Weyl nodal-line metal in which density functional theory (DFT) calculations uncover a topologically nontrivial electronic structure featuring six pairs of Weyl nodes near the Fermi level (𝐸F) and pronounced Berry-curvature hot spots at high-symmetry points, and accompanied by a large topological Hall response. High-quality epitaxial films exhibit robust ferromagnetism with a high Curie temperature (𝑇C) of approximately 370 K and strong magnetocrystalline anisotropy. The magnetotransport measurements on epitaxial films reveal the corresponding Berry-curvature-driven responses, including a significantly large intrinsic anomalous Hall conductivity of 504 S/cm and a high anomalous Hall angle of 5.5%, which is in good agreement with DFT calculations. Furthermore, a substantial topological Hall resistivity of 1.6𝜇⁢Ωcm is robust across a wide temperature range, indicating the possibility of robust chiral spin textures in the thin-film geometry. These combined theoretical and experimental results establish F⁡e5⁢S⁢i3 as a unique, low-cost, centrosymmetric magnetic Weyl nodal-line material, providing a versatile platform for exploring coupled real- and reciprocal-space topologies in topological spintronic applications.

Link : https://doi.org/10.1103/flxb-4ktc , 20 August 2026

Contact Details

Sujeet Chaudhary
Department of Physics,
sujeetc@physics.iitd.ac.in