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Atomic-Scale d-pi-d Spin Coupling in Metal-Organic Coordination Structures

Direct scanning-tunneling-microscopy observation of exchange coupling between iron d electrons and organic-radical pi systems in a well-defined two-Fe, four-radical coordination unit. Shows that simultaneous antiferromagnetic coupling of each metal to the radical ligands aligns the metal-dimer spins into a ferrimagnetic state, explained by density functional and valence bond theory.

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Atomic-scale observation of d-π-d spin coupling in coordination structures Xue Zhang,1, 2, ∗Xin

In magnetic metal-organic materials, spin coupling between transition-metal d electrons and an organic radical's pi system (d-pi-d coupling) can strongly enhance magnetic ordering, but the multi-spin…