Graphene in multilayered CPP spin valves

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

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2624-2627
Number of pages4
JournalIEEE Transactions on Magnetics
Volume44
Issue number11 PART 2
DOIs
Publication statusPublished - Nov 2008

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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