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 (AR∗F/N) 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 0.65mωμ2 was obtained with an AR∗F/N of 1.89mωμ2, which corresponds to ARF/N↑∼ 1.08mωμm2 and ARF/N↓∼ 7.98mωμm2 at a (001)-Fe/Ag interface.
ASJC Scopus subject areas
- Physics and Astronomy(all)