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We studied the effect of inserting 0.5 nm-thick spacer layers (Ti, V, Cr, Mo,W) at the Pt/Co interface on the spin-orbit torques, Hall effect,magnetoresistance, saturation magnetization, and magnetic anisotropy. We findthat the damping-like spin-orbit torque decreases substantially for all sampleswith a spacer layer compared to the reference Pt/Co bilayer, consistently withthe opposite sign of the atomic spin-orbit coupling constant of the spacerelements relative to Pt. The reduction of the damping-like torque is monotonicwith atomic number for the isoelectronic 3d, 4d, and 5d elements, with theexception of V that has a stronger effect than Cr. The field-like spin-orbittorque almost vanishes for all spacer layers irrespective of their composition,suggesting that this torque predominantly originates at the Pt/Co interface.The anomalous Hall effect, magnetoresistance, and saturation magnetization arealso all reduced substantially, whereas the sheet resistance is increased inthe presence of the spacer layer. Finally, we evidence a correlation betweenthe amplitude of the spin-orbit torques, the spin Hall-like magnetoresistance,and the perpendicular magnetic anisotropy. These results highlight thesignificant influence of ultrathin spacer layers on the magnetotransportproperties of heavy metal/ferromagnetic systems.

Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers