  The ability to control the generation of spins in arbitrary directions is a
long-sought goal in spintronics. Charge-to-spin interconversion (CSI) phenomena
depend strongly on symmetry. Systems with reduced crystal symmetry allow
anisotropic CSI with unconventional components, where charge and spin currents
and the spin polarization are not mutually perpendicular to each other. Here,
we demonstrate experimentally that the CSI in graphene-WTe2 induces spins with
components in all three spatial directions. By performing multi-terminal
nonlocal spin precession experiments, with specific magnetic field
orientations, we discuss how to disentangle the CSI from the spin Hall and
inverse spin galvanic effects.
