In this report we present a method improving GMR characteristics by replacing the ferromagnetic materials of the metal-based spin-valves in current-perpendicular-to- plane (CPP) geometry. AΔR (the product of the element area, A, and the change in resistance, ΔR) was investigated for three kinds of ferromagnetic materials : Co_<90>Fe_<10> (material A), Fe_<50>Co_<50> (material B), and Fe_<50>Co_<50> with 0.13 nm Cu layers (material C). AΔR is 1.0 mΩμm^2, 1.6 mΩμm^2, and 2.9 mΩμm^2 for materials A, B, and C, respectively. Simple analysis using the Valet-Fert model leads to two results. The first is that both the spin-dependent interface and bulk resistance are enhanced when material A is replaced by material B. The second is that the spin-dependent bulk resistance is increased when material B is replaced by material C. These results suggest the possibility of increasing AΔR without increasing the element resistance AR of spin valves in CPP geometry.
