Abstract
We report oscillatory antiferromagnetic (AFM) interlayer exchange coupling (IEC) in a trilayer film with Co2Fe(Al0.5Si0.5) (CFAS) Heusler alloy ferromagnetic layers and a Ag spacer layer. The AFM-IEC was observed only in the films annealed at >400 °C, suggesting the enhancement of the interfacial spin-dependent scattering by improved B2 order in the CFAS film is its origin. Using the AFM coupled trilayer, we demonstrated a scissors-type trilayer CPP-GMR device with relatively large ΔRA of 4.5 mΩ μm2 and MR ratio of 24%.
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