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Polyalanine molecules (PA) with an {\alpha}-helix conformation gatheredrecently a lot of interest as the propagation of electrons through the chiralbackbone structure comes along with spin polarization of the transmittedelectrons. By means of scanning tunneling microscopy and spectroscopy atambient conditions, PA molecules adsorbed on surfaces of epitaxial magneticAl2O3/Pt/Au/Co/Au nanostructures with perpendicular anisotropy were studied.Thereby, a correlation between the PA molecules ordering at the surface withthe electron tunneling across this hybrid system as a function of the substratemagnetization orientation as well as the coverage density and helicity of thewas observed. The highest spin polarization values, P, were found forwell-ordered self-assembled monolayers and with a defined chemical coupling ofthe molecules to the magnetic substrate surface, showing that the currentinduced spin selectivity is a cooperative effect. Thereby, P deduced from theelectron transmission along unoccupied molecular orbitals of the helicalmolecules is larger as compared to values derived from the occupied molecularorbitals. Apparently, the larger orbital overlap is resulting in a higherelectron mobility yielding a higher P value. By switching the magnetizationdirection of the Co-layer, it was demonstrated that the non-spin-polarized STMcan be used to study chiral molecules with a sub-molecular resolution, todetect properties of buried magnetic layers and to detect the spin polarizationof the molecules from the change of the magnetoresistance of such hybridstructures.

Cooperative effect of electrons spin polarization in a hybrid  nanostructure of a magnetic thin film with adsorbed chiral molecules studied  with non-spin-polarized scanning tunneling microscopy