Abstract

A model of the energy diagram is proposed for graphene (Gr) monolayer formed on a magnetic transition metal (MTM). The regimes of the strong and weak Gr–MTM coupling are considered; the analytical expressions have been derived for the magnetization induced by a substrate in epitaxial graphene in these regimes. It is shown that, in the strong coupling regime, a quasi-local state gives the main contribution to the magnetization; in this case, the coupling has an antiferromagnetic character. In the weak coupling regime, the main contribution to the magnetization is given by states of the d band of MTM, which leads to the ferromagnetic character of the coupling. The numerical estimations are performed for the Gr/Ni(111) and Gr/Co(poly) and they are compared with the experimental data for Gr/Ni(111) and the calculated results for Cr/Co/Ni(111). In the first case, the results agree quantitatively and, in the second case, qualitatively.

中文翻译：

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磁性金属基底诱导的外延石墨烯的磁化

摘要

针对在磁性过渡金属（MTM）上形成的石墨烯（Gr）单层，提出了能量图模型。考虑了强-弱Gr-MTM耦合的机制；在这些情况下，已经得出了外延石墨烯中衬底引起的磁化的解析表达式。结果表明，在强耦合状态下，准局部状态对磁化起主要作用。在这种情况下，耦合具有反铁磁特性。在弱耦合状态下，对磁化的主要贡献由d的状态给出MTM带，导致耦合的铁磁特性。对Gr / Ni（111）和Gr / Co（poly）进行了数值估计，并将它们与Gr / Ni（111）的实验数据和Cr / Co / Ni（111）的计算结果进行了比较。在第一种情况下，结果在数量上是一致的，在第二种情况下，在质量上是一致的。