Fig. 5. (a) Spin asymmetry map of cyclophane 2 chemisorbed to a Co nanoisland, generated from two spin-polarized conductance maps (Fig. S11†) recorded at V_b = −0.5 V and I_t = 1.0 nA while applying an external magnetic field of ±1 T, respectively, perpendicular to the surface. The definition and sign convention for the spin asymmetry A is given in eqn (S1) of the ESI.† (b) Spin asymmetry profiles along the longitudinal molecular axes of two molecules 2 (red and black) and for comparison on the bare Cu(111) surface (green). According to the discussion of eqn (S2) in the ESI,† the profiles show no spin polarization on Cu(111), inverted hybridization-induced spin polarization over the Fc sites nearly equal in magnitude to that on Co(111), and no significant spin polarization over the upper pyrene sites.