Using current-perpendicular-to-plane (CPP) giant magnetoresistance (GMR) measurement, we have evaluated the bulk and interface spin scattering asymmetric coefficients, F and F/N and the specific interfacial resistance, ARF/N, for exchange-biased spin-valves consisting of artificially ordered B2 structure Fe50Co50 and Ag spacer layer. Artificially epitaxial ordered Fe50Co50 superlattices have been successfully fabricated on MgO (001) substrate by alternate monatomic layer (AML) deposition at a substrate temperature of 75 C. The structural properties of the full epitaxial trilayer, AML[Fe/Co] n/Ag/AML[Fe/Co]n, on the Ag electrode have been confirmed by in situ reflection high-energy electron diffraction and transmission electron diffraction microscopy. A considerably large resistance-area product change and MR ratio (RA 3 mm2 and MR ratio ∼5) were confirmed even at thin AML[Fe/Co]n layer at room temperature (RT) in our spin-valve elements. The estimated values of F and F/N were 0.80 and 0.84 0.02, respectively, from the Valet-Fert theory analysis of RA as a function of thickness of the ferromagnetic layer (3, 4, and 5 nm) on the basis of the two-current model.
ASJC Scopus subject areas
- Physics and Astronomy(all)