Spin transport driven by strong spin orbit coupling at 2-dimensional conducting SrTiO₃ surface

The field of spintronics now goes beyond the injection and detection of electron spins, and expands and diversifies into new opportunities such as spin-caloritronics of spin and magnon, spin-orbitronics using spin orbital coupling, and spinterface using spin at the material interface. Here we bypass the problem by generating a spin current not through the spin injection from outside but instead through the inherent spin Hall effect, and demonstrate the non-local spin transport. The analysis on the non-local spin voltage, confirmed by the signature of a Larmor spin precession and its length dependence. We report nonlocal spin-transport on two-dimensional surface-conducting SrTiO₃ (STO) without a ferromagnetic spin injector via the spin Hall effect (and inverse spin-Hall effect). By applying magnetic fields to the Hall bars at different angles to the nonlocal spin-diffusion, we demonstrate an anisotropic spin-signal that is consistent with a Hanle precession of a pure spin current.