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In this paper, we investigate the electronic transport properties of aquantum dot (QD) connected to two ferromagnetic leads and one superconductorlead in the Kondo regime by means of the finite-$U$ slave boson mean fieldapproach and nonequilibrium Green function technique. In this three-terminalhybrid nano-device, we will focus our attention on the joint effects of theKonod correlation, superconducting proximity pairing, and spin polarization ofleads. It is found that: the superconducting proximity effect will suppress thelinear local conductance (LLC) stemming from the weakened Kondo peak, and whenits coupling $\Gamma_s$ is bigger than the tunnel-coupling $\Gamma$ of twonormal leads, the linear cross conductance (LCC) becomes negative in the Kondoregion; for antiparallel configuration, increasing spin polarization furthersuppresses LLC but enhances LCC, i.e. causing larger negative values of LCC,since it is benefit for emergence of cross Andreev reflection; On the contrary,for parallel configuration, with increasing spin polarization, the LLC descendsand greatly widens with the appearance of shoulders, and eventually splits intofour peaks, and meanwhile the LCC reduces relatively rapidly to the normalconductance.

Enhanced negative nonlocal conductance in an interacting quantum dot connected to two ferromagnetic leads and one superconducting lead