We demonstrate that electrospray deposition enables the fabrication of highly periodic self-assembled arrays of Fe₄H single molecule magnets on graphene/Ir(111). The energetic positions of molecular states are probed by means of scanning tunneling spectroscopy, showing pronounced long- and short-ranged spatial modulations, indicating the presence of both locally varying intermolecular as well as adsorption-site dependent molecule–substrate interactions. From the magnetic field dependence of the X-ray magnetic circular dichroism signal, we infer that the magnetic easy axis of each Fe₄H molecule is oriented perpendicular to the sample surface and that after the deposition the value of the uniaxial anisotropy is identical to the one in bulk. Our findings therefore suggest that the observed interaction of the molecules with their surrounding does not modify the molecular magnetism, resulting in a two-dimensional array of molecular magnets that retain their bulk magnetic properties.

中文翻译：

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石墨烯上Fe ₄分子磁体的单轴二维超晶格

我们证明，电喷雾沉积能够在石墨烯/ Ir（111）上制造高周期性的Fe ₄ H单分子磁体的自组装阵列。分子态的高能位置通过扫描隧道光谱法进行探测，显示出明显的长程和短程空间调制，表明存在分子间以及分子与底物相关的分子间相互作用。从X射线圆圆二色性信号的磁场依赖性，我们可以推断出每个Fe ₄的磁易轴H分子的取向垂直于样品表面，并且在沉积之后，单轴各向异性的值与整体上的值相同。因此，我们的发现表明，观察到的分子与其周围环境的相互作用不会改变分子磁性，导致分子磁体的二维阵列保持其整体磁性能。