Ac. Reilly et al., Perpendicular giant magnetoresistance of Co91Fe9/Cu exchange-biased spin-valves: further evidence for a unified picture, J MAGN MAGN, 195(2), 1999, pp. L269-L274
Measurements are reported of the increase in specific resistance, A Delta R
, with increasing Co91Fe9 layer thickness in current-perpendicular to the p
lane (CPP) exchange-biased spin-valves (EBSVs) of Co91Fe9 and Cu. Analysis
of these measurements yields a spin anisotropy parameter for Co91Fe9 of bet
a = 0.65 +/- 0.05, and a spin diffusion length of l(sf)(CoFe) = 12 +/- 1 nm
. The value of beta agrees reasonably well with those obtained experimental
ly and theoretically for dilute CoFe alloys, thus providing additional supp
ort for a unified picture of spin-polarized transport in CPP-MR and bulk al
loys. This value of l(sf)(CoFe), and the previously determined l(sf)(Py) fo
r Permalloy, scale approximately inversely with the residual resistivities
of the two alloys. (C) 1999 Elsevier Science B.V. All rights reserved.