Spin-to-Charge Conversion in Transition-Metal-Dichalcogenide/Ferromagnet Heterostructure via Terahertz Emission Spectroscopy

Molybdenum disulphide (MoS₂), a well-known two-dimensional transition metal dichalcogenide, has been predicted to be an ideal material for spintronics because of its excellent spin-charge conversion efficiency, which originates from its strong spin-orbit coupling. To make efficient MoS₂-based spintronics devices, it is necessary to elucidate the spin-charge conversion mechanism. Using THz emission spectroscopy on MoS₂/Co heterostructure, we disentangle the contributions of the inverse spin Hall effect (ISHE) and inverse Rashba Edelstein effect (IREE) to the spin-to-charge conversion. The spin Hall angle is obtained to be ~0.15, which confirms the high spin-to-charge conversion efficiency in MoS₂. In addition, the temperature dependence of spin-to-charge conversion is studied, revealing the robust nature of both ISHE and IREE in MoS₂.