We investigate the spin-dependent electronic and transport properties of armchair graphene nanoribbons including spin-orbit coupling due to the presence of nickel and iridium adatoms by using ab initio calculations within the spin-polarized density functional theory and non-equilibrium Green's function formalism. Our results indicate that the intensity of the spin-flip precession is a direct consequence of the relaxed adsorption sites of the adatoms. We point out that d orbitals of Ni and Ir result in strong dependence on the spin-conserved and spin-flip transmission probabilities. In particular, we show that the presence of spin-orbit coupling can lead to an enhancement of the transmission probabilities especially around resonances arising due to weak coupling with specific orbitals.
Bibliographical noteFunding Information:
This research received financial support from the Brazilian agencies CAPES, CNPq and FAPESP grant number 2012/ 24227-1. A. R. R. acknowledges the support from the ICTP-SAIRF (the FAPESP project 2011/11973-4) and the ICTP-Simons Foundation Associate Scheme. This work uses the computational resources from the GRID-UNESP and the CENAPAD/SP.
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