Spins ordonnés vs température : la bataille des aimants moléculaires

Ordered spins vs. temperature: the battle of molecular magnets. Magnets are essential components in numerous technological devices, yet most are inorganic, dense, and reliant on rare-earth elements, which pose environmental, economic, and design challenges. Metal-organic frameworks (MOFs) provide a modular alternative, combining metal centers and organic ligands to control connectivity and spin interactions. This allows the creation of magnets with tunable properties, which are lighter, more versatile, and sustainable. Achieving high magnetic ordering temperatures in MOFs remains challenging because the interactions between metal centers mediated by organic linkers are typically weak. In situ or post-synthetic chemical reductions can strengthen these interactions, introducing additional spin carriers and enhancing spin couplings, bringing these materials closer to practical use near room temperature. This article presents fundmanetal concepts of magnetism, the types of magnetic order, and approaches for designing high-TC magnetic MOFs.