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Anodized aluminum oxide (AAO) nanochannels of diameter, D , of ~50 nm and length, L , of ~60 µm ( L / D : approx. 1200 in the aspect ratio), were synthesized and applied as an electrode for the electrochemical growth of Co/Cu multilayered heterojunction nanocylinders. We synthesized numerous Co/Cu multilayered nanocylinders by applying a rectangular pulsed potential deposition method. The Co layer thickness, t  Co , ranged from ~8 to 27 nm, and it strongly depended on the pulsed-potential condition for Co layers, E  Co . The Cu layer thickness, t  Cu , was kept at less than 4 nm regardless of E  Co . We applied an electrochemical in situ contact technique to connect a Co/Cu multilayered nanocylinder with a sputter-deposited Au thin layer. Current perpendicular-to-plane giant magnetoresistance (CPP-GMR) effect reached up to ~23% in a Co/Cu multilayered nanocylinder with ~4760 Co/Cu bilayers ( t  Cu : 4 nm and t  Co : 8.6 nm). With a decrease in t  Co , (Δ R / R  p ) -1 was linearly reduced based on the Valet-Fert equation under the condition of t  F &gt; l  F  sf and t  N &lt; l  N  sf . The cobalt spin-diffusion length, l  Co  sf , was estimated to be ~12.5 nm.

Determination of Cobalt Spin-Diffusion Length in Co/Cu Multilayered Heterojunction Nanocylinders Based on Valet–Fert Model