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

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

2008-08-07

arxiv.org/abs/0808.0979v1

Physics

Condensed Matter

Materials Science

Scientific paper

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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