The investigation of the structural, electronic, and magnetic characteristics of proposed systems (radical deposited graphene nanoribbon) throughout the present work is carried out with density functional theory (DFT) as implemented in the SIEST A package. Troullier-Martins norm-conserving pseudopotentials are used to describe the core-valence interactions, while the double-ζ polarization (DZP) basis set is used for valence electrons. The exchange-correlation function is approximated by Perdew-Burke-Ernzerhof's (PBE) representation of generalized gradient approximation (GGA). Geometry optimization is carried out using the conjugate gradient (CG) algorithm until the atomic forces are converged to 0.01 eV Å-1 . A mesh cutoff of 300 Ry is used. A 1 × 1 × 100 k-grid and 1 × 1 × 60 k-grid Monkhorst pack are used, after a careful convergence test, for the electronic structure calculation of the unit cell and supercell consisting of 13 unit cells respectively. A vacuum of 12 Å is used along the non-periodic directions to avoid interaction between periodic replicas of the system. The spin-dependent electron transport properties are calculated using T ranSIEST A code adopting the NEGF-DFT method in the spirit of Landauer-Büttiker formalism. For transport calculations Monkhorst-pack of 1×1×100 kgrid in x, y and z directions is used. The coupling of left/right electrodes to the scattering region is taken into account using self-energies denoted as Σ L,R . The level broadening due to coupling between the scattering region and left/right electrodes is given by