Molecular magnetic materials, such as single-molecule magnets (SMMs) composed of a single paramagnetic metal center complexed by organic ligands, are of intense interest for their potential application as traditional bits in high-density data storage or as qubits in quantum computers. It is generally assumed that these paramagnetic centers behave independently of one another, though spin-spin couplings among the molecules are known to contribute to magnetic relaxation. Few techniques exist to directly probe intermolecular magnetic interactions in SMMs. We have utilized inelastic neutron scattering (INS) to reveal these interactions in a field-induced SMM, Mn(TPP)Cl (TPP2- = meso-tetraphenylporphyrinate), as an oscillatory Q-dependence of the magnetic transition. INS and computational results are discussed.

Probing intermolecular magnetic interactions in a metal complex by inelastic neutron scattering

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