Spin communication over 30 $\mu$m long channels of chemical vapor deposited graphene on SiO${}_2$

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 $\mu$m in platinum-based chemical vapor deposition (Pt-CVD) synthesized single-layer graphene on SiO${}_2$/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 x 10${}^{12}$ cm${}^{-2}$, 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${}_2$/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 $\mu$m long graphene channels. These observations indicate that Pt-CVD graphene is a promising material for large-scale spin-based logic-in-memory applications.

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• Universal spin diffusion length in polycrystalline graphene
• Thermally Activated Processes for Ferromagnet Intercalation in Graphene-Heavy Metal Interfaces
• Robust Spin Interconnect with Isotropic Spin Dynamics in Chemical Vapour Deposited Graphene Layers and Boundaries
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• Charge-spin conversion signal in WTe2 van der Waals hybrid devices with a geometrical design
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• Upper limit of spin relaxation in suspended graphene
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• Resilient Intraparticle Entanglement and its Manifestation in Spin Dynamics of Disordered Dirac Materials
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