Large effect of metal substrate on magnetic anisotropy of Co on hexagonal boron nitride

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Abstract

We combine x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD) and x-ray magnetic linear dichroism (XMLD) data with first principles density functional theory (DFT) calculations and a multiorbital many-body Hamiltonian approach to understand the electronic and magnetic properties of Co atoms adsorbed on h-BN/Ru(0001) and h-BN/Ir(111). The XAS line shape reveals, 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 μeV) on h-BN/Ir(111). XMLD data together with both DFT calculations and the results of the multiorbital Hubbard model suggest that the dissimilar 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).

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Gallardo, I., Arnau, A., Delgado, F., Baltic, R., Singha, A., Donati, F., … Brune, H. (2019). Large effect of metal substrate on magnetic anisotropy of Co on hexagonal boron nitride. New Journal of Physics, 21(7). https://doi.org/10.1088/1367-2630/ab3077

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