We intend to deposit a magnetic molecule, on the surface of 6ZGNRH to induce the spin-filtering effects. We have used trimethylenemethane (TMM) as the prototypical organic radical. TMM has a planar structure and 2µ B magnetic moment (shown in Figure ). Due to its planar structure and high magnetic moment, TMM is expected to strongly adsorb on the ZGNRH surface. The TMM-based derivatives are practical for spintronic applications, such as in Organic Light Emitting Diode (OLED) systems using open-shell molecules as emitters. TMM radical has a triplet ground state with a singlet-triplet energy gap of 0.45 eV . The carbon-carbon (C -C) bond lengths and carbon-hydrogen (C -H) bond lengths of TMM radical in its ground state are 1.424 Å and 1.102 Å respectively, which is in good agreement with the previously reported values (C -C = 1.407 Å and C -H = 1.08 Å) by Slipchenko et al. The angle between different carbon atoms of TMM, C2 -C1 -C3, C2 -C1 -C4, and C3 -C1 -C4 are 120 • in the triplet state. The HOMO-LUMO gap of TMM is 1.22 eV in the triplet state. The spin density plot of TMM is shown in Figure , which shows that spin density is equally distributed on the three carbon atoms (C2, C3, and C4). We have deposited the TMM radical on 6ZGNRH in different geometric configurations. The calculated adsorption energies of different configurations of TMM on 6ZGNRH are tabulated in table II. The adsorption energy is -0.203 eV , -0.199 eV , -0.208 eV , and -1.336 eV for T6ZN-G1, T6ZN-G2, T6ZN-G3 and T6ZN-G4 respectively. The negative adsorption energy in all the configurations reveals the energetical stability of the systems. The minimum perpendicular distance (d m ) between the 6ZGNRH and TMM radical is 2.968 Å, 2.966 Å, 2.930 Å and 1.626 Å in T6ZN-G1, T6ZN-G2, T6ZN-G3 and T6ZN-G4 respectively. It is observed that TMM is physisorbed on 6ZGNRH in configurations T6ZN-G1, T6ZN-G2 and T6ZN-G3 while it is chemisorbed in configuration T6ZN-G4. The bond length between the graphene carbon atoms and TMM's carbon atoms is C z1 -C2 = 1.626 Å and C z2 -C3 = 1.632 Å. The TMM is chemisorbed in a particular geometric configuration, where TMM's C1, C2 and C3 carbon atoms are adsorbed on the top site of 6ZGNRH. In this particular geometric configuration, p z orbitals of C1, C2 and C3 atoms of TMM and p z orbitals of carbon atoms of 6ZGNRH have maximum overlap, which results in π -π bond formation between them.