氧化铕诱导铁磁石墨烯中的自旋极化输运是当前自旋电子学的前沿课题之一。然而，有限偏压非线性输运行为和器件输运时间特性等课题基本内容在目前的研究中尚未涉及。同时，现有的理论研究普遍基于类比氧化铕/铝界面得到的Zeeman劈裂型自旋电子能带结构，而最近的第一性原理计算和电子输运实验表明其为半金属型。本项目拟在半金属模型下，研究铁磁石墨烯中自旋电子的线性响应特征、有限偏压非线性行为和器件时间特性。通过自旋过滤效应、自旋依赖的巨磁阻效应、自旋阀效应，自旋依赖的负微分电阻效应，以及自旋电子的集体群时延等内容的研究，探索铁磁石墨烯中自旋电子的输运性质及其物理机制。以期增进人们对铁磁石墨烯中自旋极化输运的认识，并为设计多功能自旋电子器件提供物理模型和理论依据。

The spin-polarized transport in EuO induced ferromagnetic (FM) graphene is currently one of the frontier issues of spintronics. Nonlinear transport behavior under finite bias and time characteristics of electronic devices are basic contents of the issue, but have not been touched yet. Meanwhile, the current theoretical studies are based on a Zeeman-splitting type spin energy band obtained from the analogy with the EuO/Al interface; however, the latest first principle calculations and electronic transport experiments indicate a half-metal type one. Using the half-metal model, the present project investigates linear response features, nonlinear transport behaviors under finite bias, and tunneling time characteristics of spin electrons in FM graphene. Specifically, the spin filter effect, spin dependent giant magnetoresistance effect, spin valve effect, spin dependent negative differential resistance, and collective group delays of spin electrons will be investigated, from which the spin electronic transport and physical mechanisms in FM graphene will be revealed. The purpose of this project is to promote the knowledge of spin-polarized transport in FM graphene, and to provide physical models and theoretical basis for designing multi-functional spintronics devices based on FM graphene.