Studying topological properties of ferromagnetic Weyl semimetals

This study explores the magneto-optical properties of the Weyl semimetal Co₃Sn₂S₂ using the Magneto-Optical Kerr Effect (MOKE) and compares these findings with those obtained from Anomalous Hall Effect (AHE) measurements. By employing both single detector MOKE and Kerr imaging techniques, we track the magnetization behavior across various temperatures, highlighting the influence of topological phases. Our results reveal a distinct Kerr rotation angle peak at 125K, attributed to the enhanced Berry curvature near Weyl points. The study demonstrates that MOKE, especially when combined with pump-probe techniques and advanced imaging, provides a comprehensive understanding of magnetic dynamics and topological contributions. These findings pave the way for future research into the interplay of electric and magnetic fields in topological materials, aiming to optimize the application of MOKE in spintronic devices and fundamental physics exploration.