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The magnetic anisotropy and exchange coupling between spins localized at thepositions of 3d transition metal atoms forming two-dimensional metal-organiccoordination networks (MOCNs) grown on the Au(111) metal surface are studied.In particular, we consider MOCNs made of Ni or Mn metal centers linked by TCNQ(7,7,8,8-tetracyanoquinodimethane) organic ligands, which form rectangularnetworks with 1:1 stoichiometry. Based on the analysis of X-ray magneticcircular dichroism (XMCD) data taken at T= 2.5 K, we find that Ni atoms in theNi-TCNQ MOCNs are coupled ferromagnetically and do not show any significantmagnetic anisotropy, while Mn atoms in the Mn-TCNQ MOCNs are coupledantiferromagnetically and do show a weak magnetic anisotropy within-planemagnetization. We explain these observations using bothamodelHamiltonian based on mean-fieldWeiss theory and density functional theorycalculations that include spin-orbit coupling. Our main conclusion is that theantiferromagnetic coupling between Mn spins and the in-plane magnetization ofthe Mn spins can be explained neglecting effects due to the presence of theAu(111) surface, while for Ni-TCNQ the metal surface plays a role indetermining the absence of magnetic anisotropy in the system.

Magnetic properties of metal-organic coordination networks based on 3d transition metal atoms