期刊
PHYSICAL REVIEW B
卷 84, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.075453
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资金
- National Research Foundation of Korea (NRF) [R17-2008-007-01001-0, 2009-0083380, R31-2008-000-10059-0]
- National Research Foundation of Korea [R17-2008-007-01001-0, 2008-0060548, 2009-0083380, R31-2011-000-10059-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A spin injection is achieved in a direct-contact cobalt-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 (similar to 10 meV) suggests that covalently bonded adsorbates, rather than charged impurities, govern the spin relaxation in diffusive graphene.
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