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Neutron spectroscopy and magnetic relaxation of the Mn6 nanomagnets |
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| Authors: | S Carretta T Guidi P Santini G Amoretti O Pieper B Lake J van Slageren F El Hallak W Wernsdorfer H Mutka M Russina CJ Milios EK Brechin |
| Institution: | 1. Dipartimento di Fisica, Università di Parma, I-43100 Parma, Italy;3. ISIS Pulsed Neutron Facility, Rutherford Appleton Laboratory, Chilton, OX11 0QX, United Kingdom;4. Helmholtz-Zentrum Berlin fur Materialien und Energie (HZB), Glienicker Straße 100, 14109 Berlin, Germany;5. Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany;6. 1. Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany;7. School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom;8. Laboratoire Louis Néel-CNRS, F-38042 Grenoble Cedex, France;9. Institute Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex, France;10. University of Edinburgh, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom |
| 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. |
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