After one decade of 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 $\mathrm{Ti}/\mathrm{Fe}\text{−}\mathrm{Co}\text{−}\mathrm{B}$ 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 $\mathrm{Pt}$/ferromagnet interface and can promote strong perpendicular magnetic anisotropy. We also find a minimal orbital Hall effect in 3d Ti.

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• Rashba coupling
• Spin Hall effect
• Spin current
• Spin filtering
• Spin torque
• Magnetic multilayers