Spin communication over 30 μm long channels of chemical vapor deposited graphene on SiO2
Gebeyehu, Zewdu M. (Universitat Autònoma de Barcelona)
Parui, S. (Katholieke Universiteit te Leuven (1970-))
Sierra, Juan F. (Institut Català de Nanociència i Nanotecnologia)
Timmermans, Matias (Institut Català de Nanociència i Nanotecnologia)
Esplandiu Egido, Maria José (Institut Català de Nanociència i Nanotecnologia)
Brems, S. (Imec)
Huyghebaert, Cedric (Imec)
Garello, Kevin (Imec)
Costache, Marius Vasile (Institut Català de Nanociència i Nanotecnologia)
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia)

Date:	2019
Abstract:	We demonstrate a high-yield fabrication of non-local spin valve devices with room-temperature spin lifetimes of up to 3 ns and spin relaxation lengths as long as 9 μm in platinum-based chemical vapor deposition (Pt-CVD) synthesized single-layer graphene on SiO/Si substrates. The spin-lifetime systematically presents a marked minimum at the charge neutrality point, as typically observed in pristine exfoliated graphene. However, by studying the carrier density dependence beyond n ∼ 5 × 10 cm, via electrostatic gating, it is found that the spin lifetime reaches a maximum and then starts decreasing, a behavior that is reminiscent of that predicted when the spin-relaxation is driven by spin-orbit interaction. The spin lifetimes and relaxation lengths compare well with state-of-the-art results using exfoliated graphene on SiO/Si, being a factor two-to-three larger than the best values reported at room temperature using the same substrate. As a result, the spin signal can be readily measured across 30 μm long graphene channels. These observations indicate that Pt-CVD graphene is a promising material for large-scale spin-based logic-in-memory applications.
Grants:	European Commission 696656 Ministerio de Economía y Competitividad MAT2013-46785-P Agencia Estatal de Investigación MAT2016-75952-R Ministerio de Economía y Competitividad MAT2015-68307-P Ministerio de Ciencia, Innovación y Universidades SEV-2017-0706 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-827 Ministerio de Economía y Competitividad BES-2014-069925 European Commission 665919
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Published in:	2D materials, Vol. 6, Num. 3 (July 2019) , p. 034003, ISSN 2053-1583

DOI: 10.1088/2053-1583/ab1874

Postprint 20 p, 950.6 KB

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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