Abstract We have studied growth and magnetism of Fe on graphene and graphite surfaces grown on SiC substrate. Magneto-optical Kerr effect (MOKE) results show that the magnetic dead layer exists on both surfaces. Fe on graphene exhibits larger magnetic anisotropy with almost perfect remanence magnetization above Fe deposition of nominal 7.5 A thickness. On the other hand, Fe on graphite, with oval nanoparticles, has a low magnetic anisotropy, and hysteresis appears at Fe deposition of nominal 15 A thickness. X-ray photoelectron measurements suggest that the higher anisotropy and thinner magnetic dead layer for Fe/graphene does not come from the difference in interface mixing. A structural investigation by scanning tunneling microscopy reveals that Fe forms nanoparticles on both carbonized surfaces and that on graphene the aspect ratio of the Fe particles between the height and width is much smaller compared with that on graphite. The shape anisotropy originating from the morphological changes is consistent with the MOKE results. The formation of the low-profile Fe nanoparticle on the graphene indicates the higher surface energy on the graphene/SiC. The different surface energy derived from the interaction between graphene layer and the substrate drastically modifies magnetic properties of Fe overlayers.

中文翻译：

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Fe在石墨烯和碳化硅上生长的厚石墨上的形貌和磁性

摘要 我们研究了 Fe 在石墨烯和 SiC 衬底上生长的石墨表面上的生长和磁性。磁光克尔效应（MOKE）结果表明磁死层存在于两个表面。石墨烯上的 Fe 表现出更大的磁各向异性，在标称 7.5 A 厚度的 Fe 沉积之上几乎完美的剩磁磁化。另一方面，具有椭圆形纳米颗粒的石墨上的 Fe 具有低磁各向异性，并且在标称 15 A 厚度的 Fe 沉积中出现磁滞。X 射线光电子测量表明，Fe/石墨烯更高的各向异性和更薄的磁死层不是来自界面混合的差异。通过扫描隧道显微镜进行的结构研究表明，Fe 在两个碳化表面上形成纳米粒子，并且在石墨烯上，Fe 粒子在高度和宽度之间的纵横比与石墨相比要小得多。源于形态变化的形状各向异性与 MOKE 结果一致。在石墨烯上形成低剖面 Fe 纳米颗粒表明石墨烯 / SiC 具有更高的表面能。源自石墨烯层和基板之间相互作用的不同表面能极大地改变了 Fe 覆盖层的磁性。在石墨烯上形成低剖面 Fe 纳米颗粒表明石墨烯 / SiC 具有更高的表面能。源自石墨烯层和基板之间相互作用的不同表面能极大地改变了 Fe 覆盖层的磁性。在石墨烯上形成低剖面 Fe 纳米颗粒表明石墨烯 / SiC 具有更高的表面能。源自石墨烯层和基板之间相互作用的不同表面能极大地改变了 Fe 覆盖层的磁性。