Further to investigate the applicability of GNRs as spin filters, especially for FM ZGNRs, we have reduced the width of blue dotted portion of scattering region symmetrically from both edges of nanoribbon in a way to reach red dotted portion, shown in Figure and The transmission spectra of the series of models with reducing width for both AGNRH and ZGNRH, along with the pristine 13AGNRH and 12ZGNRH is shown in Figure . As already discussed, pristine AGNRH and ZGNRH results in plateau-like transmission spectra.