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We have studied the Co layer thickness dependences of magnetocrystallineanisotropy (MCA), Dzyaloshinskii-Moriya interaction (DMI), and orbital momentanisotropy (OMA) in W/Co/Pt trilayers, in order to clarify their correlationswith each other. We find that the MCA favors magnetization along the filmnormal and monotonically increases with decreasing effective magnetic layerthickness ($t_\mathrm{eff}$). The magnitude of the Dzyaloshinskii-Moriyaexchange constant ($|D|$) increases with decreasing $t_\mathrm{eff}$ until$t_\mathrm{eff} \sim$1 nm, below which $|D|$ decreases. The MCA and $|D|$ scalewith $1/t_\mathrm{eff}$ for $t_\mathrm{eff}$ larger than $\sim$1 nm, indicatingan interfacial origin. The increase of MCA with decreasing $t_\mathrm{eff}$continues below $t_\mathrm{eff}$ $\sim$ 1 nm, but with a slower rate. Toclarify the cause of the $t_\mathrm{eff}$ dependences of MCA and DMI, the OMAof Co in W/Co/Pt trilayers is studied using x-ray magnetic circular dichroism(XMCD). We find non-zero OMA when $t_\mathrm{eff}$ is smaller than $\sim$0.8nm. The OMA increases with decreasing $t_\mathrm{eff}$ more rapidly than whatis expected from the MCA, indicating that factors other than OMA contribute tothe MCA at small $t_\mathrm{eff}$. The $t_\mathrm{eff}$ dependence of the OMAalso suggests that $|D|$ at $t_\mathrm{eff}$ smaller than $\sim$1 nm is notrelated to the OMA at the interface. We propose that the growth of Co on Wresults in a strain and/or texture that reduces the interfacial DMI, and, tosome extent, MCA at small $t_\mathrm{eff}$.

On the relationship between orbital moment anisotropy, magnetocrystalline anisotropy, and Dzyaloshinskii-Moriya interaction in W/Co/Pt trilayers