Frequency?Independent Terahertz Anomalous Hall Effect in DyCo ₅ , Co ₃₂ Fe ₆₈ , and Gd ₂₇ Fe ₇₃ Thin Films from DC to 40 THz

The anomalous Hall effect (AHE) is a fundamental spintronic charge-to-charge-current conversion phenomenon and closely related to spin-to-charge-current by the spin effect. Future high-speed devices will crucially rely on such phenomena at terahertz (THz) frequencies. Here, it revealed that AHE remains operative from DC up 40 THz with flat frequency response in thin films of three technologically relevant magnetic materials: DyCo5, Co32Fe68, Gd27Fe73. frequency-dependent conductivity-tensor elements ?xx ?yx are measured, good agreement measurements found. experimental findings fully consistent ab initio calculations for CoFe highlight role large Drude scattering rate (?100 THz) metal films, which smears out any sharp spectral features AHE. Finally, found intrinsic contribution dominates over extrinsic mechanisms Co32Fe68 sample. results imply effects as highly promising ingredients future reliably operating beyond.