  The magnetic proximity effect (MPE) is a well-established magnetic phenomenon
that occurs at certain heavy metal (HM)/ferromagnet (FM) interfaces. However,
there is still an active debate as to whether the presence of a MPE affects
spin transport through such a HM/FM interface. Here we demonstrate that the MPE
at Pt/Co and Au0.25Pt0.75/Co interfaces can be enhanced substantially by
thermal annealing protocols. From this ability, we show that the MPE has no
discernable influence on either the damping-like or the field-like spin-orbit
torques exerted on the FM layer due to the spin Hall effect of the HM layer,
indicating a minimal role of the MPE compared to other interfacial effects,
e.g. spin memory loss and spin backflow.
