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Spin relaxation properties in graphene due to its linear dispersion

2011; American Physical Society; Volume: 84; Issue: 7 Linguagem: Inglês

10.1103/physrevb.84.075453

1550-235X

Sanghyun Jo, Dong‐Keun Ki, Dongchan Jeong, Hu-Jong Lee, Stefan Kettemann,

Advancements in Battery Materials

A spin injection is achieved in a direct-contact cobalt$\ensuremath{-}$single-layer graphene nonlocal spin-valve system, overlaid with a top gate. The spin signal is retained even in bipolar configurations of graphene. Hanle spin-precession analysis demonstrates that proportionality between spin and momentum relaxation times, which supports the Elliot-Yafet-type spin relaxation, holds consistently only when the carrier-density dependence of the density of states is taken into account. The corresponding strong spin-orbit coupling ($\ensuremath{\sim}$10 meV) suggests that covalently bonded adsorbates, rather than charged impurities, govern the spin relaxation in diffusive graphene.