Low-Temperature Magnetization Dynamics of Magnetic Molecular Solids in a   Swept Field
  The swept-field experiments on magnetic molecular solids such as \Fe8 are studied using Monte Carlo simulations. A kinetic equation is developed to understand the phenomenon. It is found that the simulations provide a quantitatively accurate account of the experiments. The kinetic equation provides a similarly accurate account except at very low sweep velocities, where it fails modestly. This failure is due to the neglect of short-range correlations between the dipolar magnetic fields seen by the molecular spins. Both the simulations and the kinetic equation provide a good understanding of the distribution of these dipolar fields. 
Erik Lenferink, Avinash Vijayaraghavan, and Anupam Garg
cond-mat.stat-mech