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.A?R(the product of the element area,A,and the change in resistance,?R)was investigated for three kinds of ferromagnetic materials:Co^<90>Fe^<10>(materials A), Fe^<50>Co^<50>(materials B), and Fe^<50>Co^<50> with 0.13nm Cu layers(materials C).A?R is 1.0.mΩμm^2,1.6mΩμm^2,and 2.9mΩμm^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 materials B is replaced by material C.These results suggest the possibility of increasing A?R wihtout increasing the element resistance AR of spin valves in CPP geometry.
|Translated title of the contribution||MR enhancement of CPP-GMR in Spin-valve: Role of the ferromagnetic layers in metal-based spin-valve|
|Number of pages||4|
|Journal||IEICE technical report|
|Publication status||Published - Sep 26 2002|