We report magnetization switching by spin-transfer torque in an epitaxial spin-valve nanopillar made with a half-metallic full-Heusler Co2FeAl0.5Si0.5 (CFAS) alloy. The CFAS/Ag/CFAS spin valves showed a magnetoresistance ratio of 7%–9%, and spin-transfer switching was clearly observed in the nanopillar by applying a relatively small dc current (∼106 A/cm2 in current density). Statistical analysis based on a thermal activation model revealed an averaged critical current density (Jc0) of 9.3×106 A/cm2 with a thermal stability factor (KV/kBT) of ∼40.
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Sukegawa et al. (2010) studied this question.
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