Neutron spectroscopy and magnetic relaxation of the Mn$_6$ nanomagnets

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Authors
Carretta, S.
Guidi, T.
Santini, P.
Amoretti, G.
Pieper, O.
Lake, B.
van Slageren, J.
Hallak, F. El
Wernsdorfer, W.
Mutka, H.
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Abstract
Description
Inelastic neutron scattering has been used to determine the microscopic Hamiltonian describing two high-spin variants of the high-anisotropy Mn$_6$ 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.
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Condensed Matter - Materials Science
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