Spin diffusion and non-local spin-valve effect in an exfoliated multilayer graphene with a Co electrode. (4th July 2016)

• Record Type: Journal Article
• Authors: Li, Lijun; Lee, Inyeal; Lim, Dongsuk; Rathi, Servin; Kang, Moonshik; Uemura, Tetsuya; Kim, Gil-Ho
• Is Part Of: Nanotechnology. Volume 27:Number 33(2016)
• Publication Date: 2016-07-04
• Subjects: spin diffusion -- multilayer graphene -- spintronics; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/27/33/335201
• Languages: English
• ISSNs: 0957-4484

Abstract

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, τ s, obtained from the fitting of the Hanle curves increases with decreasing temperature with a weak dependence ∼ T − 0.065 while the spin-diffusion constant D decreases. At room temperature, τ s exceeds 100 ps and the spin-diffusion length, λ s, is ∼2 μ m. The temperature dependence of λ 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.