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02.08.2007

Nature 448, 571-574 (2 August 2007) | doi:10.1038/nature06037; Received 27 March 2007; Accepted 19 June 2007; Published online 15 July 2007



Electronic spin transport and spin precession in single graphene layers at room temperature


Nikolaos Tombros1, Csaba Jozsa1, Mihaita Popinciuc2, Harry T. Jonkman2 & Bart J. van Wees1



  1. Physics of Nanodevices,
  2. Molecular Electronics, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands


Correspondence to: Nikolaos Tombros1 Correspondence and requests for materials should be addressed to N.T. (Email: n.tombros@rug.nl).





Electronic transport in single or a few layers of graphene is the subject of intense interest at present. The specific band structure of graphene, with its unique valley structure and Dirac neutrality point separating hole states from electron states, has led to the observation of new electronic transport phenomena such as anomalously quantized Hall effects, absence of weak localization and the existence of a minimum conductivity1. In addition to dissipative transport, supercurrent transport has also been observed2. Graphene might also be a promising material for spintronics and related applications, such as the realization of spin qubits, owing to the low intrinsic spin orbit interaction, as well as the low hyperfine interaction of the electron spins with the carbon nuclei3, 4. Here we report the observation of spin transport, as well as Larmor spin precession, over micrometre-scale distances in single graphene layers. The 'non-local' spin valve geometry was used in these experiments, employing four-terminal contact geometries with ferromagnetic cobalt electrodes making contact with the graphene sheet through a thin oxide layer. We observe clear bipolar (changing from positive to negative sign) spin signals that reflect the magnetization direction of all four electrodes, indicating that spin coherence extends underneath all of the contacts. No significant changes in the spin signals occur between 4.2 K, 77 K and room temperature. We extract a spin relaxation length between 1.5 and 2 mum at room temperature, only weakly dependent on charge density. The spin polarization of the ferromagnetic contacts is calculated from the measurements to be around ten per cent.



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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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