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Magnetization and spin dynamics of a Cr-based magnetic cluster: Cr7Ni (Articolo in rivista)

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Magnetization and spin dynamics of a Cr-based magnetic cluster: Cr7Ni (Articolo in rivista) (literal)

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Bianchi A., Carretta S., Santini P., Amoretti G., Furukawa Y., Kiuchi K., Ajiro Y., Narumi Y., Kindo K., Lago J., Micotti E, Arosio P., Lascialfari A., Borsa F., Timco G. and Winpenny R.E.P. (2010)
Magnetization and spin dynamics of a Cr-based magnetic cluster: Cr7Ni
in Journal of magnetism and magnetic materials
(literal)

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Bianchi A., Carretta S., Santini P., Amoretti G., Furukawa Y., Kiuchi K., Ajiro Y., Narumi Y., Kindo K., Lago J., Micotti E, Arosio P., Lascialfari A., Borsa F., Timco G. and Winpenny R.E.P. (literal)

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1. Univ Parma, Dipartimento Fis, I-43100 Parma, Italy (Bianchi A., Carretta S., Santini P., Amoretti G.) 2. S3 CNR INFM, I-41100 Modena, Italy (Bianchi A., Carretta S., Santini P., Amoretti G., Lago J., Micotti E., Arosio P., Lascialfari A., Borsa F. 3. Hokkaido Univ, Div Phys, Sapporo, Hokkaido 0600810 Japan (Furukawa Y.) 4. Kyoto Univ, Dept Chem, Kyoto 6068502, Japan (Ajiro Y.) 5. Japan Sci & Technol Corp JST, CREST, Tokyo 1028581, Japan (Ajiro Y.) 6. Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan (Narumi Y., Kindo K.) 7. Univ Pavia, Dipartimento Fis A Volta, I-27100 Pavia, Italy (Lago J., Micotti E., Arosio P., Lascialfari A., Borsa F.) 8. Univ Milan, Dipartimento Sci Mol Applicate Biosistemi, I-20134 Milan, Italy (Arosio P., Lascialfari A.) 9. Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs England (Timco G., Winpenny R.E.P.) (literal)

Titolo

Abstract

We study the magnetization and the spin dynamics of the Cr7Ni ring-shaped magnetic cluster. Measurements of the magnetization at high pulsed fields and low temperature are compared to calculations and show that the spin Hamiltonian approach provides a good description of the Cr7Ni magnetic molecule. In addition, the phonon-induced relaxation dynamics of molecular observables has been investigated. By assuming the spin-phonon coupling to take place through the modulation of the local crystal fields, it is possible to evaluate the decay of fluctuations of two generic molecular observables. The nuclear spin-lattice relaxation rate 1/T-1 directly probes such fluctuations, and allows to determine the magnetoelastic coupling strength. (C) 2009 Elsevier B.V. All rights reserved. (literal)

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