Determination of the spin-lifetime anisotropy in graphene using oblique spin precession
Raes, Bart (Institut Català de Nanociència i Nanotecnologia)
Scheerder, Jeroen E. (KU Leuven. Department of Physics and Astronomy)
Costache, Marius Vasile. (Institut Català de Nanociència i Nanotecnologia)
Bonell, Frédéric (Institut Català de Nanociència i Nanotecnologia)
Sierra, Juan F. (Institut Català de Nanociència i Nanotecnologia)
Cuppens, Jo (Institut Català de Nanociència i Nanotecnologia)
Van De Vondel, Joris (KU Leuven. Department of Physics and Astronomy)
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia)

Date:	2016
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.
Grants:	European Commission 308023 Ministerio de Economía y Competitividad MAT2013-46785-P Ministerio de Economía y Competitividad SEV-2013-0295 European Commission 624897
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Graphene ; Magnetic properties and materials ; Spintronics
Published in:	Nature communications, Vol. 7 (May 2016) , art. 11444, ISSN 2041-1723

DOI: 10.1038/ncomms11444
PMID: 27157318

7 p, 628.4 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles