Spin Injection into Graphene from Heusler Alloy Co2MnGe (111) Surface: A First Principles Study
To obtain a larger spin signal for use in graphene-based spintronic devices, the spin injection efficiency needs to be enhanced.Previously researchers can increase the efficiency by inserting a tunnel barrier such as Al2O3 or MgO between ferromagnet and graphene.However, the key value in spin transport is still very low because of the conductance mismatch as well as the limit to fabricate a high-quality tunnel barrier at the junction surface.Here we use a highly spin-polarized ferromagnetic material~Heusler alloy Co2MnGe as a substitutional scheme without the tunnel barrier.The spin injection efficiency of our Co2MnGe (111)/graphene junction can be as high as 73% which is much higher than 1% of ferromagnet/graphene or 30% of ferromagnet/oxide/graphene using first-principles study.The large spin polarization can be explicated by analyzing the transmission spectrum at the nonequilibrium state.
Spin injection Spintronics Graphene Heusler alloy First principle study
Yaxin Wang Tongsheng Xia
NO.37 Xueyuan Road, Haidian District, Beijing, China
国际会议
银川
英文
111-116
2017-08-16（万方平台首次上网日期，不代表论文的发表时间）