Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms11444
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Funding
- European Research Council [308023 SPINBOUND]
- Spanish Ministry of Economy and Competitiveness, MINECO [MAT2013-46785-P, SEV-2013-0295]
- Secretariat for Universities and Research, Knowledge Department of the Generalitat de Catalunya
- Ramon y Cajal program
- Juan de la Cierva program
- Beatriu de Pinos program
- European Union [624897]
- Methusalem Funding of the Flemish Government
- Research Foundation-Flanders (FWO)
- ICREA Funding Source: Custom
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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.
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