  After one decade of the intensive theoretical and experimental explorations,
whether interfacial spin-orbit coupling (ISOC) at metallic magnetic interfaces
can effectively generate a spin current has remained in dispute. Here,
utilizing the Ti/FeCoB bilayers that are unique for the negligible bulk spin
Hall effect and the strong tunable ISOC, we establish that there is no
significant charge-to-spin conversion at magnetic interfaces via spin-orbit
filtering effect or Rashba-Edelstein(-like) effect even when the ISOC is
stronger than that of a typical Pt/ferromagnet interface and can promote strong
perpendicular magnetic anisotropy. We also find a minimal orbital Hall effect
in 3d Ti.
