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Advances in molecular spintronics rely on the in-depth characterization ofthe molecular building blocks in terms of their electronic and, moreimportantly, magnetic properties. For this purpose, inert substrates thatinteract only weakly with adsorbed molecules are required in order to preservetheir electronic states. Here, we investigate the magnetic-field response of asingle paramagnetic 5,5-dibromosalophenatocobalt(II) (CoSal) molecule adsorbedon a weakly interacting magnetic substrate, namely Fe-intercalated graphene(GR/Fe) grown on Ir(111), by using spin-polarized scanning tunneling microscopyand spectroscopy (SP-STM/STS). We have obtained local magnetization curves,spin-dependent tunneling spectra, and spatial maps of magnetic asymmetry for asingle CoSal molecule, revealing its magnetic properties and coupling to thelocal environment. The distinct magnetic behavior of the Co-metal center isfound to rely strictly on its position relative to the GR/Fe moire structure,which determines the level of hybridization between the GR/Fe surfacepi-system, the molecular ligand pi-orbitals and the molecular Co-ion d-orbital.

Probing weakly hybridized magnetic molecules by spin-polarized tunneling