Co
2Fe
xMn
1-xSi (CFMS) is one of the most attractive highly spin-polarized materials since large tunnel magneto-resistance and giant magneto-resistance have been recenltly observed in the devices using CFMS electrodes. In this study, we investigated the dependence of CPP-GMR in CFMS/Ag/CFMS on Fe composition
x and annealing temperature
Tann for CFMS electrodes. The highest intrinsic MR ratio of 55% and Δ
RA of 17.2 mΩ•μm
2 were achieved at
x = 0.5 and
Tann = 550°C. Finally, we compared the results on CPP-GMR with those on TMR, anisotropic magneto-resistance and damping constant for CFMS and discussed half-metallicity of CFMS.
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