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We investigate the effect of capping layer (CAP) on the interfacial magneticanisotropy energy density (K_S), magnetic damping ({\alpha}), and spin-orbittorques (SOTs) in heavy-metal (Pt) / ferromagnet (Co or Py) / CAP (MgO/Ta,HfOx, or TaN). At room temperature (RT) the CAP materials influence theeffective magnitude of K_S, which is associated with a formation of interfacialmagnetic oxides. The dynamical dissipation parameters of Co are considerablyinfluenced by the CAP (especially MgO) while those of Py are not. This ispossibly due to an extra magnetic damping via spin-pumping process across theCo/CoO interface and incoherent magnon generation (spin fluctuation) in theinterfacial CoO. It is also observed that both anti-damping and field-like SOTefficiencies vary marginally with the CAP in the thickness ranges we examined.Our results reveal the crucial role of interfacial oxides on the perpendicularmagnetic anisotropy, magnetic damping, and SOTs.

Influences of interfacial oxidization on surface magnetic energy, magnetic damping and spin-orbit-torques in Pt / ferromagnet / capping structures