In this work, the many-spin interactions taking place in Mn12 large-spin clusters are extensively studied using the 8-spin model Hamiltonian, for which we determine the possible parameters based on experimental data. Account of the many-spin excitations satisfactorily explains positions of the neutron scattering peaks, results of EPR measurements and the temperature dependence of magnetic susceptibility. In particular, strong Dzyaloshinsky-Morya interactions are found to be important for description of neutron scattering data. The role of these interactions for the relaxation of the magnetization is qualitatively discussed.
@article{arxiv.cond-mat/9807176,
title = {Many-Spin Interactions and Spin Excitations in Mn12},
author = {M. I. Katsnelson and V. V. Dobrovitski and B. N. Harmon},
journal= {arXiv preprint arXiv:cond-mat/9807176},
year = {2009}
}