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Spin-dependent rectification in the C 59 N molecule

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Abstract

Coherent spin-dependent electron transport is investigated in three conditions: (1) a C60 molecule is connected to two ferromagnetic (FM) electrodes symmetrically, (2) a C59N molecule is connected to two FM electrodes symmetrically and (3) a C59N molecule is connected to two FM electrodes asymmetrically. This work is based on a single-band tight-binding model Hamiltonian and the Green’s function approach with the Landauer–Buttiker formalism. Electrodes used in this study are semi-infinite FM electrodes with finite cross-section. Obvious rectification effect is observed in the C59N molecule which is connected to the FMelectrodes asymmetrically. This effect is more in the P alignment of FM electrodes than in AP alignment of FM electrodes. This study indicates that the rectification behaviour is due to the asymmetry in molecule and junctions. Also in this investigation tunnel magnetoresistance (TMR) is calculated for these molecules. Asymmetry is observed in TMR of C59N which is coupled to the electrodes asymmetrically due to asymmetric junctions, but TMR of C60 is symmetric.

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Authors and Affiliations

  1. Department of Physics and Nanocentre Research, Ferdowsi University of Mashhad, Mashhad, Iran

    MAHVASH ARABI DAREHDOR & NASSER SHAHTAHMASEBI

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  1. MAHVASH ARABI DAREHDOR
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  2. NASSER SHAHTAHMASEBI
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Correspondence to MAHVASH ARABI DAREHDOR.

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DAREHDOR, M.A., SHAHTAHMASEBI, N. Spin-dependent rectification in the C 59 N molecule. Pramana - J Phys 80, 327–336 (2013). https://doi.org/10.1007/s12043-012-0505-0

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  • DOI: https://doi.org/10.1007/s12043-012-0505-0

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