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We inserted non-magnetic layers of Au and Cu into sputtered AlOx-basedmagnetic tunnel junctions and Meservey-Tedrow junctions in order to study theireffect on tunnelling magnetoresistance (TMR) and spin polarization (TSP). Wheneither Au or Cu are inserted into a Co/AlOx interface, we find that TMR and TSPremain finite and measurable for thicknesses up to several nanometres.High-resolution transmission electron microscopy shows that the Cu and Auinterface layers are fully continuous when their thickness exceeds ~3 nm,implying that spin-polarized carriers penetrate the interface noble metal todis- tances exceeding this value. A power law model based on exchangescattering is found to fit the data better than a phenomenological exponentialdecay. The discrepancy between these length scales and the much shorter onesreported from x-ray magnetic circular dichroism studies of magneticproximitization is ascribed to the fact that our tunnelling transportmeasurements selectively probe s-like electrons close to the Fermi level. Whena 0.1 nm thick Cu or Au layer is inserted within the Co, we find that thesuppression of TMR and TSP is restored on a length scale of <=1 nm, indicatingthat this is a sufficient quantity of Co to form a fully spin-polarized bandstructure at the interface with the tunnel barrier.

Long-ranged magnetic proximity effects in noble metal-doped cobalt probed with spin- dependent tunnelling