The effect of atomic structure on interface spin-polarization of half-metallic spin valves: Co2MnSi/Ag epitaxial interfaces

Zlatko Nedelkoski, Philip J. Hasnip, Ana M. Sanchez, Balati Kuerbanjiang, Edward Higgins, Mikihiko Oogane, Atsufumi Hirohata, Gavin R. Bell, Vlado K. Lazarov

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Using density functional theory calculations motivated by aberration-corrected electron microscopy, we show how the atomic structure of a fully epitaxial Co2MnSi/Ag interfaces controls the local spin-polarization. The calculations show clear difference in spin-polarization at Fermi level between the two main types: bulk-like terminated Co/Ag and Mn-Si/Ag interfaces. Co/Ag interface spin-polarization switches sign from positive to negative, while in the case of Mn-Si/Ag, it is still positive but reduced. Cross-sectional atomic structure analysis of Co2MnSi/Ag interface, part of a spin-valve device, shows that the interface is determined by an additional layer of either Co or Mn. The presence of an additional Mn layer induces weak inverse spin-polarisation (-7%), while additional Co layer makes the interface region strongly inversely spin-polarized (-73%). In addition, we show that Ag diffusion from the spacer into the Co2MnSi electrode does not have a significant effect on the overall Co2MnSi /Ag performance.

Original languageEnglish
Article number212404
JournalApplied Physics Letters
Volume107
Issue number21
DOIs
Publication statusPublished - 2015 Nov 23

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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