Significantly Unconventional Enhancement of Anomalous Hall Angle in Magnetic Weyl Semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2-x</sub>Se<sub>x</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 41766341.
- Also identified by DOI 10.1002/adma.202522443.
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Abstract
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 Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub> 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 Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub> 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.