  We report on large thermoelectric effects in superconductor-ferromagnet
tunnel junctions in proximity contact with the ferromagnetic insulator europium
sulfide. The combination of a spin-splitting field and spin-polarized tunnel
conductance in these systems breaks the electron-hole symmetry and leads to
spin-dependent thermoelectric currents. We show that the exchange splitting
induced by the europium sulfide boosts the thermoelectric effect in small
applied fields and can therefore eliminate the need to apply large magnetic
fields, which might otherwise impede applications in thermometry or cooling.
