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Proceedings Paper

Enhanced spin injection efficiency and extended spin lifetimes in graphene spin valves
Author(s): Wei Han; J. R. Chen; K. M. McCreary; H. Wen; R. K. Kawakami
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Paper Abstract

Enhanced spin injection efficiency and extended spin lifetimes are achieved in graphene spin valves. Spin injection efficiency is enhanced via tunneling spin injection into graphene through an MgO barrier. A large nonlocal magetoresistance of 130 Ω is observed for a single layer graphene (SLG) spin valve at room temperature (RT) with spin injection efficiency of ~ 26-30%. Extended spin lifetimes are observed using tunneling contact to suppress the contact induced spin relaxation. In SLG, spin lifetime as long as 771 ps is observed at RT. In bilayer graphene (BLG), we observe the spin lifetime of 6.2 ns at 20 K, which is the longest value reported in any graphene spin valve. Furthermore, contrasting spin relaxation behaviors are observed in SLG and BLG, which suggests that Elliot-Yafet spin relaxation dominates in SLG at low temperatures, while Dyakonov-Perel spin relaxation dominates in BLG at low temperatures.6

Paper Details

Date Published: 16 September 2011
PDF: 8 pages
Proc. SPIE 8100, Spintronics IV, 81000Q (16 September 2011); doi: 10.1117/12.901199
Show Author Affiliations
Wei Han, Univ. of California, Riverside (United States)
J. R. Chen, Univ. of California, Riverside (United States)
K. M. McCreary, Univ. of California, Riverside (United States)
H. Wen, Univ. of California, Riverside (United States)
R. K. Kawakami, Univ. of California, Riverside (United States)


Published in SPIE Proceedings Vol. 8100:
Spintronics IV
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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