  Motivated by the recent achievements in manipulation of C60 molecules in STM
experiments, we study theoretically the structure and electronic properties of
a C60 molecule in an STM-tunneljunction with a magnetic tip and magnetic adatom
on a Cu(111) surface from first-principle calculations. For the case of V
tip/adatom, we demonstrate how spin-coupling between the magnetic V atoms
mediated by the C60 can be observed in the electronic transport, which display
a strong spin-filtering effect, allowing mainly majority-spin electrons to
pass(>95%). Moreover, we find a significant change in the conductance between
parallel and anti-parallel spin polarizations in the junction (86%) which
suggests that STM experiments should be able to characterize the magnetism and
spin-coupling for these systems.
