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Tunnel magnetoresistance of the heterocyclic molecular junctions: A green's function approach

Journal of Superconductivity and Novel Magnetism, ISSN: 1557-1939, Vol: 25, Issue: 6, Page: 1965-1970
2012
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Article Description

We explore the spin-dependent transport properties in a molecular junction model made of heterocyclic molecules such as poythiophene, polyfuran, and polypyrrole sandwiched between ferromagnetic three-dimensional electrodes, hereafter named FM/h-molecule/FM junction, based on a tight-binding model and a generalized Green's function method in the Landauer-Büttiker formalism. The coherent spin-dependent transport through the energy levels of heterocyclic molecules, the transmittance, current-voltage (I-V ) characteristics, and the tunnel magnetoresistance (TMR) of the FM/h-molecule/FM junction are numerically investigated. It is found that the spin-dependent transport properties are importantly influenced by the heteroatoms in the heterocyclic molecules. It is shown that the TMR of the molecular junction can be quite large (over 69 %) depending on the applied voltage and the molecular field of the FM electrodes. © Springer Science+Business Media, LLC 2012.

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