  The organic spinterface describes the spin-polarized properties that develop,
due to charge transfer, at the interface between a ferromagnetic metal (FM) and
the molecules of an organic semiconductor. Yet, if the latter is also magnetic
(e.g. molecular spin chains), the interfacial magnetic coupling can generate
complexity within magnetotransport experiments. Also, assembling this interface
may degrade the properties of its constituents (e.g. spin crossover or
non-sublimable molecules). To circumvent these issues, one can separate the
molecular and FM films using a less reactive nonmagnetic metal (NM).
Spin-resolved photoemission spectroscopy measurements on the prototypical
system Co(001)//Cu/Mnphthalocyanine (MnPc) reveal that the Cu/MnPc spinterface
atop ferromagnetic Co is highly spin-polarized at room temperature, up to Cu
spacer thicknesses of at least 10 monolayers. Ab-initio theory describes a spin
polarization of the topmost Cu layer after molecular hybridization that can be
accompanied by magnetic hardening effects. This spinterface's unexpected
robustness paves the way for 1) integrating electronically fragile molecules
within organic spinterfaces, and 2) manipulating molecular spin chains using
the well-documented spin transfer torque properties of the FM/NM bilayer.
