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Spin-singlet Cooper pairs consisting of two electrons with opposite spinscannot directly penetrate from a superconductor to a half-metal (fully spinpolarized ferromagnets) which blocks the superconducting proximity effectbetween these materials. In this paper we demonstrate that, nevertheless, twohalf-metallic layers electrically coupled to the superconducting filmsubstantially affect its critical temperature and produce the spin valveeffect. Within the tight-binding model for the atomically thin multilayeredspin valves we show that depending on the details of the electron energyspectra in half-metals the critical temperature as a function of the anglebetween the spin quantization axes in half-metals can be either monotonicallyincreasing or decreasing. This finding highlights the crucial role of the bandstructure details in the proximity effect with half-metals which cannot beadequately treated in the quasiclassical theories.

Crossover between standard and inverse spin-valve effect in atomically thin superconductor/half-metal structures