Tunnel magnetoresistance of FM–organic molecule–FM junction: A Green's function approach

Coherent spin-dependent electronic transport is investigated in a molecular junction made of organic molecule attached to two the semi-infinite ferromagnetic (FM) electrodes with finite cross sections. The conductance properties of the spin system are studied for a chain of benzene rings (oligophenylene). The work is based on a single band tight-binding model Hamiltonian and the Green's function approach with the Landauer–Büttiker formalism. It is shown that tunnel magnetoresistance (TMR) of molecular junction can be large (over 60%) by adjusting the related parameters, and depends on: (i) the applied voltages and (ii) the number of benzene rings.

Based on a π-orbital tight-binding model Hamiltonian and the Green's function approach together with the Landauer–Bütikker formalism, we investigated the coherent spin-dependent transport properties of ferromagnetic–organic molecule–ferromagnetic junctions.Figure optionsDownload as PowerPoint slideResearch highlights
► We investigate the spin transport and TMR in FM–organic molecule–FM system.
► The conductance properties of the spin system are studied for oligophenylene molecule.
► The lattice of ferromagnetic electrode is semi-infinite simple cubic.
► TMR maximum value for molecular junction is obtained in low applied voltage.