  We study the electric and thermoelectric transport properties of correlated
quantum dots coupled to two ferromagnetic leads and one superconducting
electrode. Transport through such hybrid devices depends on the interplay of
ferromagnetic-contact induced exchange field, superconducting proximity effect
and correlations leading to the Kondo effect. We consider the limit of large
superconducting gap. The system can be then modeled by an effective Hamiltonian
with a particle-non-conserving term describing the creation and annihilation of
Cooper pairs. By means of the full density-matrix numerical renormalization
group method, we analyze the behavior of electrical and thermal conductances,
as well as the Seebeck coefficient as a function of temperature, dot level
position and the strength of the coupling to the superconductor. We show that
the exchange field may be considerably affected by the superconducting
proximity effect and is generally a function of Andreev bound state energies.
Increasing the coupling to the superconductor may raise the Kondo temperature
and partially restore the exchange-field-split Kondo resonance. The competition
between ferromagnetic and superconducting proximity effects is reflected in the
corresponding temperature and dot level dependence of both the linear
conductance and the (spin) thermopower.
