Photo-induced anomalous Hall effect in ferromagnetic (Co)/transition metal dichalcogenide (WS 2 ) heterostructure

The photo-induced Hall effect is shown in the Co/WS 2 heterostructure. This heterostructure consists of a ferromagnetic metal layer that forms a Schottky junction to a transition metal dichalcogenide semiconductor layer. In this effect, under the magnetic field and light irradiation, the excited charge carriers from the WS 2 layer diffuse into the Co layer and are driven by Lorentz forces, then creates a transverse voltage in the open circuit. This open circuit voltage is a function of light and magnetic field intensity. The photo-induced voltage is nonlinear and hysteretic with the applied magnetic field and is in good agreement with magneto-optical Kerr's hysteresis loops. The observed results can provide a new technique for optical and magnetic sensing applications. In addition, it proposed a new technique to reconstruct the in-plane magnetic hysteresis loop for metallic thin films.