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Issue 34, 2017
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Giant magnetoresistance and perfect spin filter effects in manganese phthalocyanine based molecular junctions

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Abstract

The spin-filter transport and magnetoresistance effects are of particular interest in the field of molecular spintronics. In this work, based on first-principles quantum transport calculations, we report on the spin-dependent transport properties of a molecular junction made of two manganese phthalocyanine (MnPc) molecules linked by single-walled carbon nanotubes. Owing to the half-metallicity of MnPc around the Fermi energy, a perfect spin-filter effect and a giant magnetoresistance effect are observed in the molecular junction. The current–voltage characteristics show nearly ohmic behavior for the junction in an anti-parallel magnetic configuration, while a very low-bias negative differential resistance effect is observed for the junction in a parallel magnetic configuration. The results are well understood from the analysis of molecular frontier orbitals, scattering states and transmission spectra. Our results provide some fundamental understanding of spin-dependent transport in molecular junctions that are useful for the design of future spintronic devices.

Graphical abstract: Giant magnetoresistance and perfect spin filter effects in manganese phthalocyanine based molecular junctions

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Publication details

The article was received on 17 May 2017, accepted on 27 Jul 2017 and first published on 27 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03532B
Citation: Nanoscale, 2017,9, 12684-12689
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    Giant magnetoresistance and perfect spin filter effects in manganese phthalocyanine based molecular junctions

    L. L. Tao and J. Wang, Nanoscale, 2017, 9, 12684
    DOI: 10.1039/C7NR03532B

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