Anomalous Hall effect in a near room-temperature soft ferromagnet AlFe 2 B 2

We report the anisotropic magnetization and the anomalous Hall effect (AHE) in single-crystalline ${\mathrm{AlFe}}_{2}{\mathrm{B}}_{2}$, which undergoes a ferromagnetic (FM) transition at 275 K. The intrinsic mechanism is essential for the AHE in the FM state, resulting in a significant anomalous Hall conductivity of over 200 ${\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}1}\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ at low temperatures. Due to its moderate susceptibility as a soft magnet, this material exhibits a high resistivity sensitivity across a wide temperature range, suggesting its potential as an anomalous Hall sensor for detecting weak magnetic fields.