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 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/T1 directly probes such fluctuations, and allows to determine the magnetoelastic coupling strength.
@article{arxiv.0808.2621,
title = {Magnetization and spin dynamics of a Cr-based magnetic cluster: Cr$_{7}$Ni},
author = {A. Bianchi and S. Carretta and P. Santini and G. Amoretti and Y. Furukawa and K. Kiuchi and Y. Ajiro and Y. Narumi and K. Kindo and J. Lago and E. Micotti and P. Arosio and A. Lascialfari and F. Borsa and G. Timco and R. E. P. Winpenny},
journal= {arXiv preprint arXiv:0808.2621},
year = {2008}
}
Comments
3 pages, 2 figures, submitted as a contributed article for the Jems conference in Dublin (September 14-19 2008)