exchange-biased spin-valves: further evidence for a uni"ed picture
نویسندگان
چکیده
Measurements are reported of the increase in speci"c resistance, A*R, with increasing Co 91 Fe 9 layer thickness in current-perpendicular to the plane (CPP) exchange-biased spin-valves (EBSVs) of Co 91 Fe 9 and Cu. Analysis of these measurements yields a spin anisotropy parameter for Co 91 Fe 9 of b"0.65$0.05, and a spin di!usion length of lC0F% 4& "12$1 nm. The value of b agrees reasonably well with those obtained experimentally and theoretically for dilute CoFe alloys, thus providing additional support for a uni"ed picture of spin-polarized transport in CPP-MR and bulk alloys. This value of lC0F% 4& , and the previously determined lP: 4& for Permalloy, scale approximately inversely with the residual resistivities of the two alloys. ( 1999 Elsevier Science B.V. All rights reserved. PACS: 73.40; 72.15; 73.50; 75.50R
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