  We report Coulomb blockade transport studies of InAs nanowires grown with
epitaxial superconducting Al and ferromagnetic insulator EuS on overlapping
facets. By comparing experimental results to a theoretical model, we associate
cotunneling features in even-odd bias spectra with spin-polarized Andreev
levels, indicating that spin splitting exceeding the induced superconducting
gap at zero applied magnetic field. Energies of the polarized subgap states can
be tuned on either side of zero by electrostatic gates.
