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We combine x-ray absorption spectroscopy (XAS), x-ray magnetic circulardichroism (XMCD) and x-ray magnetic linear dichroism (XMLD) data with firstprinciples density functional theory (DFT) calculations and a multiorbital manybody Hamiltonian approach to understand the electronic and magnetic propertiesof Co atoms adsorbed on h-BN/Ru(0001) and h-BN/Ir(111). The XAS line shapereveals, for both substrates, an electronic configuration close to $3d^8$,corresponding to a spin $S = 1$. Magnetic field dependent XMCD data show large(14 meV) out-of-plane anisotropy on h-BN/Ru(0001), while it is almost isotropic(tens of $\mu$eV) on h-BN/Ir(111). XMLD data together with both DFTcalculations and the results of the multiorbital Hubbard model suggest that thedissimilar magnetic anisotropy originates from different Co adsorption sites,namely atop N on h-BN/Ru(0001) and 6-fold hollow on h-BN/Ir(111).

Large effect of the metal substrate on the magnetic anisotropy of Co on hexagonal Boron Nitride