  We report on nonlocal spin transport in mesoscopic superconducting aluminum
wires in contact with the ferromagnetic insulator europium sulfide. We find
spin injection and long-range spin transport in the regime of the exchange
splitting induced by europium sulfide. Our results demonstrate that spin
transport in superconductors can be manipulated by ferromagnetic insulators,
and opens a new path to control spin currents in superconductors.
