Robustness of the Half-Metallicity at the Interfaces in Co 2 Mn Si -Based All-Full-Heusler-Alloy Spintronic Devices

B. Pradines (1) , L. Calmels (1) , Rémi Arras (1)

1 CEMES-MEM - Matériaux et dispositifs pour l'Electronique et le Magnétisme

Based on first-principles methods, we demonstrate that it would be possible to design efficient all-full-Heusler-alloy-based spintronic devices associating Co2MnSi electrodes and nonmagnetic full-Heusler-alloy spacers selected to preserve the half-metallicity of Co2MnSi up to the interface atomic layers. We focus on the Co2MnSi/Fe2TiSi magnetic tunnel junction, compare the stability range of its different interface terminations, and show that the half-metallicity of the Fe2/MnSi-terminated interface even withstands atomic intermixing. The robustness of the half-metallicity of this interface termination is also confirmed in Co2MnSi/Fe2VAl spin valves. With such interfaces, spintronic devices could possess very high magnetoresistive properties.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Physique Numérique [physics.comp-ph]; Electronique

B. Pradines, L. Calmels, Rémi Arras. Robustness of the Half-Metallicity at the Interfaces in Co 2 Mn Si -Based All-Full-Heusler-Alloy Spintronic Devices. Physical Review Applied, 2021, 15 (3), pp.034009. ⟨10.1103/PhysRevApplied.15.034009⟩. ⟨hal-03295006⟩