Magnetic proximity, magnetoresistance and spin filtering effect in a binuclear ferric phthalocyanine from first principles

Using density functional theory within the nonequilibrium Green's function formalism, we studied the spin transport through a binuclear ferric phthalocyanine (Fe2Pc2) connected to aurum nanowire electrodes. The Fe2Pc2 molecular devices exhibit a perfect spin filtering effect and larger magnetoresistance ratio even there not exist magnetic electrodes. The spin polarized transport comes from the magnetic proximity to the central Fe atoms at the center of each phthalocyanine that cause the molecule to develop finite magnetic character. Compared with traditional magnetic tunnel junction, the spin transport of the proposed molecular junction can be tuned only by altering the magnetization orientation of the Fe atom at the center of molecule.