Abstract
We experimentally investigated the asymmetric transmission probabilities of spin-up and spin-down electrons at a (001)-Fe/Ag interface, which result in a highly spin-dependent interface resistance () that improves the magnetoresistive outputs of giant magnetoresistive devices whose ferromagnetic layers comprise only 3d transitional materials such as FeCo-based alloys. We quantitatively determined the spin-dependent interfacial parameters at FexCo100-x/Ag interfaces that were tuned by varying the Fe concentration x. Among the interfaces, the highest interface resistance of 0.65 mΩ·µm2 was obtained with an of 1.89 mΩ·µm2, which corresponds to ARF/N↑ ∼ 1.08 mΩ·µm2 and ARF/N↓ ∼ 7.98 mΩ·µm2 at a (001)-Fe/Ag interface.
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