Bulk and interfacial scatterings in current-perpendicular-to-plane giant magnetoresistance with CO_2Fe( Al_(0.5)Si_(0.5)) Heusler alloy layers and Ag spacer

摘要

We report the transport properties of a current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) device with CO_2Fe(Al_(0.5)Si_(0.5)) (CFAS) Heusler alloy ferromagnetic layers and a Ag spacer layer. The CPP-GMR devices showed relatively high ΔRA values and MR ratios up to 17 m Ω μm~2 and 80% at 14 K, and 8 m Ω μm~2 and 34% at 290 K. The spin diffusion length ～3 nm and the bulk spin asymmetry ～0.77 for the CFAS alloy at 14 K were estimated by the Valet-Fert model, indicating a large contribution of the interfacial scattering.