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

Source: [First-principles study of spin-transfer torque in Co2MnSi/Al/Co2MnSi spin-valve](<https://www.sota2.com/research/paper/68fa32e41e209131ce88ba38>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T03:38:49.449Z

Authors: Ling Tang, Zejin Yang

Published: 2013-08-30T10:29:56.000Z

## Abstract

The spin-transfer torque (STT) in Co2MnSi(CMS)/Al/Co2MnSi spin-valve system with and without interfacial disorder is studied by a first-principles noncollinear wave-function-matching method. It is shown that in the case of clean interface the angular dependence of STT for CoCo/Al (the asymmetry parameter Lambda approx. 4.5) is more skewed than that for MnSi/Al (Lambda approx. 2.9), which suggests the clean CoCo/Al architecture is much more efficient for the application on radio frequency oscillation. We also find that even with interfacial disorder the spin-valve of half-metallic CMS still has a relatively large parameter Lambda compared to that of conventional ferromagnet. In addition, for clean interface the in-plane torkance of MnSi/Al is about twice as large as that of CoCo/Al. However, as long as the degree of interfacial disorder is sufficiently large, the CoCo/Al and MnSi/Al will show approximately the same magnitude of in-plane torkance. Furthermore, our results demonstrate that CMS/Al/CMS system has very high efficiency of STT to switch the magnetic layer of spin-valve.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1308.6703>)

[PDF](<https://arxiv.org/pdf/1308.6703.pdf>)