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Tunnel Magnetoresistance of the Heterocyclic Molecular Junctions: A Green’s Function Approach

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Abstract

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.

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Authors and Affiliations

  1. Department of Physics, Science and Research Branch, Islamic Azad University, Tehran, Iran

    A. Ahmadi Fouladi, S. M. Elahi & S. A. Sebt

  2. School of Physics, Damghan University, Damghan, Iran

    S. A. Ketabi

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  1. A. Ahmadi Fouladi
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  2. S. A. Ketabi
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  3. S. M. Elahi
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  4. S. A. Sebt
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Correspondence to A. Ahmadi Fouladi.

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Ahmadi Fouladi, A., Ketabi, S.A., Elahi, S.M. et al. Tunnel Magnetoresistance of the Heterocyclic Molecular Junctions: A Green’s Function Approach. J Supercond Nov Magn 25, 1965–1970 (2012). https://doi.org/10.1007/s10948-012-1544-y

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  • DOI: https://doi.org/10.1007/s10948-012-1544-y

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