  How spin-orbit torques emerge from materials with weak spin-orbit coupling
(e.g., light metals) is an open question in spintronics. Here, we report on a
field-like spin-orbit torque (i.e., in-plane spin-orbit field transverse to the
current axis) in SiO$_2$-sandwiched permalloy (Py), with the top Py-SiO$_2$
interface incorporating ultrathin Ti or Cu. In both SiO$_2$/Py/Ti/SiO$_2$ and
SiO$_2$/Py/Cu/SiO$_2$, this spin-orbit field opposes the classical Oersted
field. While the magnitude of the spin-orbit field is at least a factor of 3
greater than the Oersted field, we do not observe evidence for a significant
damping-like torque in SiO$_2$/Py/Ti/SiO$_2$ or SiO$_2$/Py/Cu/SiO$_2$. Our
findings point to contributions from a Rashba-Edelstein effect or spin-orbit
precession at the (Ti, Cu)-inserted interface.
