Journal
NANOTECHNOLOGY
Volume 27, Issue 33, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/27/33/335201
Keywords
spin diffusion; multilayer graphene; spintronics
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2013R1A2A2A01069023]
- Grants-in-Aid for Scientific Research [16K04872, 15K13960] Funding Source: KAKEN
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We fabricated a non-local spin valve with a thin layer of graphite with Co transparent electrodes. The spin-valve effect and spin precession were observed at room temperature. The magnitude of the mangetoresistance increases when temperature decreases. The spin-relaxation time, tau(s), obtained from the fitting of the Hanle curves increases with decreasing temperature with a weak dependence similar to T-0.065 while the spin-diffusion constant D decreases. At room temperature, tau(s) exceeds 100 ps and the spin-diffusion length, lambda(s), is similar to 2 mu m. The temperature dependence of lambda(s) is not monotonic, and it has the largest value at room temperature. Our results show that multilayer graphene is a suitable material for spintronic devices.
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