Graphene in multilayered CPP spin valves

Tariq M G Mohiuddin, Ernie Hill, Daniel Elias, Alexander Zhukov, Konstantin Novoselov, Andre Geim

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    In this paper, we have sandwiched a single-atom-thick sheet of graphene, a 2-D allotrope of carbon that is exciting tremendous research interest, between two ferromagnetic electrodes. Graphene has already been shown to support spin polarized conduction, when spin polarized electrons were injected into graphene sheets along the plane using magnetic electrodes. Here, we study spin polarized conduction perpendicular the plane of the graphene in conduction perpendicular to plane (CPP) geometry. It was found that graphene was sufficient to reduce the exchange coupling between the magnetic electrodes. We also found that in a NiFe/Au/Graphene/NiFe stack, the graphene channels the spin current perpendicular to the plane and thus produces an enhanced MR effect compared to a simple stack without the graphene. A significant anisotropy was found in the observed magnetoresistance in the cross electrode geometry employed. © 2008 IEEE.
    Original languageEnglish
    Title of host publicationIEEE Transactions on Magnetics|IEEE Trans Magn
    PublisherIEEE
    Pages2624-2627
    Number of pages3
    Volume44
    DOIs
    Publication statusPublished - Nov 2008
    EventInternational Magnetics Conference (Intermag) - Madrid, SPAIN
    Duration: 4 May 20088 May 2008

    Conference

    ConferenceInternational Magnetics Conference (Intermag)
    CityMadrid, SPAIN
    Period4/05/088/05/08

    Keywords

    • Conduction perpendicular to plane (CPP)
    • Magnetoresistive device
    • Permalloy
    • Spin valve

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