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The spin-transfer torque (STT) in Co2MnSi(CMS)/Al/Co2MnSi spin-valve systemwith and without interfacial disorder is studied by a first-principlesnoncollinear wave-function-matching method. It is shown that in the case ofclean interface the angular dependence of STT for CoCo/Al (the asymmetryparameter Lambda approx. 4.5) is more skewed than that for MnSi/Al (Lambdaapprox. 2.9), which suggests the clean CoCo/Al architecture is much moreefficient for the application on radio frequency oscillation. We also find thateven with interfacial disorder the spin-valve of half-metallic CMS still has arelatively large parameter Lambda compared to that of conventional ferromagnet.In addition, for clean interface the in-plane torkance of MnSi/Al is abouttwice as large as that of CoCo/Al. However, as long as the degree ofinterfacial disorder is sufficiently large, the CoCo/Al and MnSi/Al will showapproximately the same magnitude of in-plane torkance. Furthermore, our resultsdemonstrate that CMS/Al/CMS system has very high efficiency of STT to switchthe magnetic layer of spin-valve.

First-principles study of spin-transfer torque in Co2MnSi/Al/Co2MnSi spin-valve