Significantly Unconventional Enhancement of Anomalous Hall Angle in Magnetic Weyl Semimetal Co₃Sn₂S2-xSex.

Theoretically, introducing inhomogeneous magnetization into magnetic topological Weyl semimetals can dramatically enhance the anomalous Hall conductivity owing to the chiral-gauge field effect. However, an enhancement strategy remains elusive. Here, we demonstrate the successful generation of inhomogeneous magnetization in a recently discovered magnetic Weyl semimetal Co₃Sn₂S₂ by introducing a dopant with strong spin-orbit coupling. The giant anomalous Hall angle reached 42% at 130 K, even under a relatively weak magnetic field (∼0.1 T), making it the highest reported value. Theoretical and magnetic microstructure analyses suggest that the significantly enhanced anomalous Hall effect may be due to the chiral-gauge field induced directly by inhomogeneous magnetization in real-space. Furthermore, considering the electronic band structure of Co₃Sn₂S₂ and the chiral-gauge field, the theoretical Hall resistivity is quantitatively in good agreement with the experimental value. This study demonstrated the feasibility of dramatically manipulating the physical properties of Anomalous-Hall-angmagnetic topological materials using magnetic microstructure engineering.