Kavli Affiliate: Herre S. J. Van Der Zant
| First 5 Authors: Javier López-Cabrelles, Samuel Mañas-Valero, Iñigo J. Vitórica-Yrezábal, Makars Šiškins, Martin Lee
| Summary:
Through rational chemical design, and thanks to the hybrid nature of
metal-organic frameworks (MOFs), it is possible to prepare molecule-based 2D
magnetic materials stable at ambient conditions. Here, we illustrate the
versatility of this approach by changing both the metallic nodes and the
ligands in a family of layered MOFs that allows the tuning of their magnetic
properties. Specifically, the reaction of benzimidazole-type ligands with
different metal centres (MII = Fe, Co, Mn, Zn) in a solvent-free synthesis
produces a family of crystalline materials, denoted as MUV-1(M), which order
antiferromagnetically with critical temperatures that depend on M. Furthermore,
the incorporation of additional substituents in the ligand results in a novel
system, denoted as MUV-8, formed by covalently bound magnetic double-layers
interconnected by van der Waals interactions, a topology that is very rare in
the field of 2D materials and unprecedented for 2D magnets. These layered
materials are robust enough to be mechanically exfoliated down to a few layers
with large lateral dimensions. Finally, the robustness and crystallinity of
these layered MOFs allow the fabrication of nanomechanical resonators that can
be used to detect — through laser interferometry — the magnetic order in thin
layers of these 2D molecule-based antiferromagnets.
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