Graphene-spaced magnetic systems based on 2D transition metal-organic networks

The formation of two-dimensional metal-organic networks (2D MONs), which are atomically thin structures with well-defined two-dimensional lattices, involves coordinating metal ions with organic ligands. In this regard, tetracyanobenzene (TCNB) molecules are renowned for their strong electron-accepting properties and ability to form stable coordination bonds with transition metals. When these molecules coordinate with Fe atoms, they assemble into a well-ordered 2D network unless molecular mobility is hindered by strong molecule-substrate interactions. This condition is satisfied by deposition on graphene, where the weak van der Waals interaction between the 2D MON and graphene effectively decouples the network from the metal substrate, allowing for unique properties to emerge. On the other hand, the graphene layer may mediate the magnetic interaction between the molecules and the substrate, an essential prerequisite for the use of paramagnetic molecules as building blocks of a molecular-based spin electronics. For this purpose, cobalt will be intercalated underneath graphene and the strength and nature of the magnetic coupling studied as a function of the magnetic field and temperature.
Understanding the interplay between 2D MONs, graphene, and the influence of cobalt intercalation is crucial for tailoring the magnetic properties of these materials. While the growth parameters have been fully defined in preliminary studies, further investigations are required to define the magnetic properties, interlayer coupling mechanism, and explore the applicability of these hybrid systems in advanced electronics and spin-based technologies.