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We investigate to what extent the magnetic properties of depositednanostructures can be influenced by selecting as a support different surfacesof the same substrate material. Fully relativistic ab initio calculations wereperformed for Co monolayers and adatoms on Pd(100), Pd(111), and Pd(110)surfaces. Changing the crystallographic orientation of the surface has amoderate effect on the spin magnetic moment and on the number of holes in the dband, a larger effect on the orbital magnetic moment but sometimes a dramaticeffect on the magnetocrystalline anisotropy energy (MAE) and on the magneticdipole term T_alpha. The dependence of T_alpha on the magnetization directionalpha can lead to a strong apparent anisotropy of the spin magnetic moment asdeduced from the X-ray magnetic circular dichroism (XMCD) sum rules. Forsystems in which the spin-orbit coupling is not very strong, the T_alpha termcan be understood as arising from the differences between components of thespin magnetic moment associated with different magnetic quantum numbers m.

Co monolayers and adatoms on Pd(100), Pd(111) and Pd(110): Anisotropy of magnetic properties