Spin-Dependent Quantum Interference in Nonlocal Graphene Spin Valves

Ivan Vera Marun, M H D Guimar??es, P J Zomer, I J Vera-Marun, B J van Wees

    Research output: Contribution to journalArticlepeer-review


    Up to date, all spin transport experiments on graphene were done in a semiclassical regime, disregarding quantum transport properties such as phase coherence and interference. Here we show that in a quantum coherent graphene nanostructure the nonlocal voltage is strongly modulated. Using nonlocal measurements, we separate the signal in spin-dependent and spin-independent contributions. We show that the spin-dependent contribution is about 2 orders of magnitude larger than the spin-independent one, when corrected for the finite polarization of the electrodes. The nonlocal spin signal is not only strongly modulated but also changes polarity as a function of the applied gate voltage. By locally tuning the carrier density in the constriction via a side gate electrode we show that the constriction plays a major role in this effect. Our results show the potential of quantum coherent graphene nanostructures for the use in future spintronic devices.
    Original languageEnglish
    Pages (from-to)2952-2956
    Number of pages5
    JournalNano Letters
    Issue number5
    Publication statusPublished - May 2014


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