title: Spin diffusion and non-local spin-valve effect in an exfoliated multilayer graphene with a Co electrode.
abstract: 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, [Formula: see text], obtained from the fitting of the Hanle curves increases with decreasing temperature with a weak dependence [Formula: see text] while the spin-diffusion constant D decreases. At room temperature, [Formula: see text] exceeds 100 ps and the spin-diffusion length, [Formula: see text], is ∼2 μm. The temperature dependence of [Formula: see text] 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.
authors.affiliation: School of Electronic and Electrical Engineering and Sungkyunkwan University Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 16419, Korea.
authors.forename: Lijun
authors.initials: L
authors.lastname: Li
authors.forename: Inyeal
authors.initials: I
authors.lastname: Lee
authors.forename: Dongsuk
authors.initials: D
authors.lastname: Lim
authors.forename: Servin
authors.initials: S
authors.lastname: Rathi
authors.forename: Moonshik
authors.initials: M
authors.lastname: Kang
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Uemura
authors.forename: Gil-Ho
authors.initials: GH
authors.lastname: Kim