Abstract
By applying the density functional theory and the nonequilibrium Green’s function formalism, we investigate the spin-polarized transport properties of a Fe-oligoporphyrin dimer (Fe-P2TA) sandwiched between two armchair single-walled carbon nanotube electrodes. The results show that the system can present high-efficiency magnetoresistance, spin-filtering, and low-bias negative differential resistance effects with the help of magnetic field modulation. The above results are explained by the evolution of the spin-polarized transmission spectra and the molecular projected self-consistent Hamiltonian eigenstates with applied bias. Therefore, the system provides the possibilities for a multifunctional molecular spintronic device design.
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