Effect of Ni addition on CPP-GMR response in electrodeposited Co-Ni/Cu multilayered nanocylinders with an ultra-large aspect ratio

Effect of Co-Ni alloy composition on the current perpendicular-to-plane giant magnetoresistance (CPP-GMR) response of electrochemically synthesized Co-Ni/Cu multilayered nanocylinders was studied using anodized aluminum oxide membranes (AAOM) with nanochannel diameter D similar to 67 nm and length L similar to 70 mu m. Co-Ni/Cu multilayered nanocylinders, which have an aspect ratio L/D of similar to 1,045, were fabricated in the AAOM nanochannel templates by utilizing a pulse-current electrochemical growth process in an electrolytic bath with Co2+, Ni2+ and Cu2+ ions. Co-Ni/Cu alternating structure with Co84Ni16 alloy layer-thickness of 9.6 nm and Cu layer-thickness of 3.8 nm was clearly observed in a nanocylinder with a diameter of 63 nm. The alternating structure was composed from crystalline layers with preferential orientations in hcp-CoNi (002) and fcc-Cu (111). The Co-Ni/Cu multilayered nanocylinders were easily magnetized in the long axis direction because of the extremely large aspect ratio L/D. In Co84Ni16/Cu multilayered nanocylinders, the coercivity and squareness were similar to 0.46 kOe and similar to 0.5, respectively. The CPP-GMR value was achieved up to 22.5% (at room temperature) in Co84Ni16/Cu multilayered nanocylinders.

Automated summary

The effect of Co-Ni alloy composition on the CPP-GMR response of electrochemically synthesized Co-Ni/Cu multilayered nanocylinders was investigated. The study found that the Co-Ni/Cu multilayered nanocylinders, with a high aspect ratio of L/D, were easily magnetized in the long axis direction. Furthermore, the CPP-GMR value of up to 22.5% was achieved in Co84Ni16/Cu multilayered nanocylinders.