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Transport phenomena in clean ferromagnet-superconductor-ferromagnet (FSF)trilayers are studied theoretically for a general case of arbitrary orientationof in-plane magnetizations and interface transparencies. Generalizedexpressions for scattering probabilities are derived and the differentialconductance is computed using solutions of the Bogoliubov-de Gennes equation.We focus on size and coherence effects that characterize ballistic transport,in particular on the subgap transmission and geometrical oscillations of theconductance. We find a monotonic dependence of conductance spectra andmagnetoresistance on the angle of misorientation of magnetizations as theiralignment is changed from parallel to antiparallel. Spin-triplet paircorrelations in FSF heterostructures induced by non-collinearity ofmagnetizations are investigated by solving the Gor'kov equations in the cleanlimit. Unlike diffusive FSF junctions, where the triplet correlations have along-range monotonic decay, we show that in clean ferromagnet-superconductorhybrids both singlet and triplet pair correlations induced in the F layers areoscillating and power-law decaying with the distance from the S-F interfaces.

Ballistic transport in ferromagnet–superconductor–ferromagnet trilayers with arbitrary orientation of magnetisations