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Giant magnetoresistance and perfect spin filter in manganese phthalocyanine based molecular junction

Abstract

The spin-filter transport and magnetoresistance effect are of particular interest in the field of molecular spintronics. In this work, based on the first-principles quantum transport calculations, we report on the spin-dependent transport properties of the 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, the perfect spin-filter effect and giant magnetoresistance effect are observed in the molecular junction. The current-voltage characteristics show nearly ohmic behavior for the junction in anti-parallel magnetic configuration, while the very low-bias negative differential resistance (NDR) effect is observed for the junction in parallel magnetic configuration. The results are well understood from the analysis of molecular frontier orbitals, scattering states and transmission spectrum. Our results provide some fundamental understandings of spin-dependent transport in molecular junctions and are useful for the design of future spintronic devices.

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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, Accepted Manuscript
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    Giant magnetoresistance and perfect spin filter in manganese phthalocyanine based molecular junction

    L. Tao and J. Wang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03532B

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