Spin-memory loss at Co/Ru interfaces

Abstract

We have determined the spin-memory-loss parameter, ${\delta }_{Co/Ru}$, 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 $(1-exp(-{\delta }_{Co/Ru}))$. From the CPP-MR, we obtain ${\delta }_{Co/Ru}=0.34_{-0.02}^{+0.04}$ that is in good agreement with ${\delta }_{Co/Ru}=0.35\pm 0.08$ obtained from spin-triplet transmission. For spin-singlet transmission, we have ${\delta }_{Co/Ru}=0.64\pm 0.05$ that is different from that obtained from CPP-GMR and spin-triplet transmission. The source of this difference is not understood.

9 pages, 9 figures

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• Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance
• Advanced method for reliable estimation of the spin-orbit torque efficiency in low coercive ferromagnetic multilayers
• Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers
• Supercurrent transmission through Ni/Ru/Ni synthetic antiferromagnets