Generation of polarized spin-triplet Cooper pairings by magnetic barriers in superconducting junctions

We investigate the proximity effect in an $s$-wave superconductor/ferromagnetic metal with a Rashba spin-orbit coupling/diffusive normal metal junction and an $s$-wave superconductor/noncollinear magnetic metal/diffusive normal metal junction. We show the generation of polarized spin-triplet pairings in the diffusive normal metal due to coherent spin rotation in the intermediate magnetic regions. The emergence of the spin-triplet odd-frequency Cooper pairings can generate a zero-energy peak in the quasiparticle density of states in the diffusive normal metal.