Superconducting triplet pairings and anisotropic magnetoresistance effects in ferromagnet/superconductor/ferromagnet double-barrier junctions

Ferromagnetic spin valves offer the key building blocks to integrate giant- and tunneling-magnetoresistance effects into spintronics devices. Starting from a generalized Blonder-Tinkham-Klapwijk approach, we theoretically investigate impact of interfacial Rashba Dresselhaus spin-orbit couplings on tunneling conductance, thereby magnetoresistance characteristics, ferromagnet/superconductor/ferromagnet spin-valve junctions embedding thin superconducting spacers between either parallel or antiparallel magnetized ferromagnets. We focus unique interplay usual electron tunnelings-that fully determine in normal-conducting state-and peculiar Andreev reflections state. In presence couplings, special attention needs be paid spin-flip ("unconventional") Andreev-reflection process that is expected induce triplet correlations proximitized regions. As transport signature these pairings, detect conductance double peaks around singlet-gap energy, reflecting competition singlet an additionally emerging gap; latter effective gap can ascribed formation Cooper pairs through scatterings (i.e., generation triplet-pairing term order parameter). thoroughly analyze reflections' role connection with phenomena, eventually unravel huge magnetoanisotropies-easily exceeding their normal-state counterparts by several orders magnitude-as another experimentally accessible fingerprint unconventional reflections.