Interface-Induced Spin Polarization in Graphene on Chromia
Interface-Induced Spin Polarization in Graphene on Chromia
复制标题
氧化铬上石墨烯中界面诱导的自旋极化
DOI：
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发表时间：
2016
影响因子：
1.2
通讯作者：
R. Skomski
中科院分区：
文献类型：
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作者：
R. Choudhary;Pankaj Kumar;P. Manchanda;D. Sellmyer;P. Dowben;A. Kashyap;R. Skomski
采用密度泛函理论（DFT）和模型计算方法研究了$Cr {{2}} O {3}}$（001）表面石墨烯的诱导自旋极化.石墨烯中的磁矩是邻近效应，并且可以被视为二阶Stoner情景，并且对于具有绝缘磁性基底的所有石墨烯系统，可能实现类似的机制。在没有电荷转移的情况下，磁矩在交换场中将是二次的，与通常遇到的近似线性相关性相反。石墨烯的净磁化强度很小，约为每个原子${0.01}\ \mu_{\text{B}}$，但与能量相关的自旋极化表现出明显的峰值，对自旋极化的电子输运有很强的影响，因此对自旋电子学应用很重要。
The induced spin polarization of graphene on $\text{Cr}_{{2}}\text{O}_{{3}}$(001) is investigated using density-functional theory (DFT) and model calculations. The magnetic moment in graphene is a proximity effect and can be regarded as a second-order Stoner scenario, and similar mechanisms are likely realized for all graphene systems with an insulating magnetic substrate. In the absence of charge transfer, the magnetic moment would be quadratic in the exchange field, as contrasted to the usually encountered approximately linear dependence. The net magnetization of the graphene is small, of the order of ${0.01}\ \mu_{\text{B}}$ per atom, but the energy-dependent spin polarization exhibits pronounced peaks that have a disproportionally strong effect on the spin-polarized electron transport and are therefore important for spin-electronics applications.