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Determination of the spin-lifetime anisotropy in graphene using oblique spin precession

Author

Listed:
  • Bart Raes

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB)

  • Jeroen E. Scheerder

    (INPAC—Institute for Nanoscale Physics and Chemistry, KU Leuven)

  • Marius V. Costache

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB)

  • Frédéric Bonell

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB)

  • Juan F. Sierra

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB)

  • Jo Cuppens

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB)

  • Joris Van de Vondel

    (INPAC—Institute for Nanoscale Physics and Chemistry, KU Leuven)

  • Sergio O. Valenzuela

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB
    Institució Catalana de Recerca i Estudis Avançats (ICREA))

Abstract

We determine the spin-lifetime anisotropy of spin-polarized carriers in graphene. In contrast to prior approaches, our method does not require large out-of-plane magnetic fields and thus it is reliable for both low- and high-carrier densities. We first determine the in-plane spin lifetime by conventional spin precession measurements with magnetic fields perpendicular to the graphene plane. Then, to evaluate the out-of-plane spin lifetime, we implement spin precession measurements under oblique magnetic fields that generate an out-of-plane spin population. We find that the spin-lifetime anisotropy of graphene on silicon oxide is independent of carrier density and temperature down to 150 K, and much weaker than previously reported. Indeed, within the experimental uncertainty, the spin relaxation is isotropic. Altogether with the gate dependence of the spin lifetime, this indicates that the spin relaxation is driven by magnetic impurities or random spin-orbit or gauge fields.

Suggested Citation

  • Bart Raes & Jeroen E. Scheerder & Marius V. Costache & Frédéric Bonell & Juan F. Sierra & Jo Cuppens & Joris Van de Vondel & Sergio O. Valenzuela, 2016. "Determination of the spin-lifetime anisotropy in graphene using oblique spin precession," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11444
    DOI: 10.1038/ncomms11444
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    Cited by:

    1. Qing Rao & Wun-Hao Kang & Hongxia Xue & Ziqing Ye & Xuemeng Feng & Kenji Watanabe & Takashi Taniguchi & Ning Wang & Ming-Hao Liu & Dong-Keun Ki, 2023. "Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. B. G. Márkus & M. Gmitra & B. Dóra & G. Csősz & T. Fehér & P. Szirmai & B. Náfrádi & V. Zólyomi & L. Forró & J. Fabian & F. Simon, 2023. "Ultralong 100 ns spin relaxation time in graphite at room temperature," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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