Bulk and interfacial scatterings in current-perpendicular-to-plane giant

摘要

We report the transport properties of a current-perpendicular-to-plane giant magnetoresistancenu0002CPP-GMRu0003 device with Co2Feu0002Al0.5Si0.5u0003u0002CFASu0003 Heusler alloy ferromagnetic layers and a Agnspacer layer. The CPP-GMR devices showed relatively high u0002RA values and MR ratios up ton17 m u0003 u0004m2nand 80% at 14 K, and 8 m u0003 u0004m2nand 34% at 290 K. The spin diffusion lengthnu00043 nm and the bulk spin asymmetry u00040.77 for the CFAS alloy at 14 K were estimated by thenValet–Fert model, indicating a large contribution of the interfacial scattering. © 2010 AmericannInstitute of Physics. u0005doi:10.1063/1.3432070