Spin-memory loss at Co/Ru interfaces

We have determined the spin-memory-loss parameter, $δ_{Co/Ru}$, by measuring the transmission of spin-triplet and spin-singlet Cooper pairs across Co/Ru interfaces in Josephson junctions and by Current-Perpendicular-to-Plane Giant Magnetoresistance (CPP-GMR) techniques. The probability of spin-memory loss at the Co/Ru interface is $(1-exp(-δ_{Co/Ru}))$. From the CPP-MR, we obtain $δ_{Co/Ru} = 0.34^{+0.04}_{-0.02}$ that is in good agreement with $δ_{Co/Ru} = 0.35 \pm 0.08$ obtained from spin-triplet transmission. For spin-singlet transmission, we have $δ_{Co/Ru} = 0.64 \pm 0.05$ that is different from that obtained from CPP-GMR and spin-triplet transmission. The source of this difference is not understood.

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