We study the magnetization and the spin dynamics of the Cr7 Ni 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 Cr7 Ni 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 / T1 directly probes such fluctuations, and allows to determine the magnetoelastic coupling strength.
Magnetization and spin dynamics of a Cr-based magnetic cluster : Cr7Ni / A. Bianchi, S. Carretta, P. Santini, G. Amoretti, Y. Furukawa, K. Kiuchi, Y. Ajiro, Y. Narumi, K. Kindo, J. Lago, E. Micotti, P. Arosio, A. Lascialfari, F. Borsa, G. Timco, R.E.P. Winpenny. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 322:9-12(2010), pp. 1262-1264. [10.1016/j.jmmm.2009.03.006]
Magnetization and spin dynamics of a Cr-based magnetic cluster : Cr7Ni
P. Arosio;A. Lascialfari;
2010
Abstract
We study the magnetization and the spin dynamics of the Cr7 Ni 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 Cr7 Ni 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 / T1 directly probes such fluctuations, and allows to determine the magnetoelastic coupling strength.
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