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  Carretta, S.; Guidi, T.; Santini, P.; Amoretti, G.; Pieper, O.; Lake, B.; van Slageren, J.; El Hallak, F.; Wernsdorfer, W.; Mutka, H.; Russina, M.; Milios, C.J.; Brechin E.K.: Neutron spectroscopy and magnetic relaxation of the Mn₆ nanomagnets. Polyhedron 28 (2009), p. 1940-1944

10.1016/j.poly.2008.11.009

Abstract:
Inelastic neutron scattering has been used to determine the microscopic Hamiltonian describing two high-spin variants of the high-anisotropy Mn6 nanomagnet. The energy spectrum of both systems is characterized by the presence of several excited total-spin multiplets partially overlapping the S = 12 ground multiplet. This implies that the relaxation processes of these molecules are different from those occurring in prototype giant-spin nanomagnets. In particular, we show that both the height of the energy barrier and resonant tunnelling processes are greatly influenced by low-lying excited total-spin multiplets.