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Recent advances in scanning probe techniques rely on the chemicalfunctionalization of the probe-tip termination by a single molecule. Thesuccess of this approach opens the tantalizing prospect of introducing spinsensitivity through the functionalization by a magnetic molecule. Here, we usea nickelocene-terminated tip (Nc-tip), which offers the possibility ofproducing spin excitations on the tip apex of a scanning tunneling microscope(STM). We show that when the Nc-tip is a hundred pm away from point contactwith a surface-supported object, magnetic effects may be probed through changesin the spin excitation spectrum of nickelocene. We use this detection scheme tosimultaneously determine the exchange field and the spin polarization of thesample with atomic-scale resolution. Our findings demonstrate that the Nc-tipis a powerful probe for investigating surface magnetism with STM, from singlemagnetic atoms to surfaces.

Atomic-scale spin sensing with a single-molecule at the apex of a scanning tunneling microscope