Low-temperature magnetization dynamics of magnetic molecular solids in a swept field

Erik Lenferink, Avinash Vijayaraghavan, Anupam Garg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The swept-field experiments on magnetic molecular solids such as Fe8 are studied using Monte Carlo simulations, and a kinetic equation developed to understand collective magnetization phenomena in such solids, where the collective aspects arise from dipole-dipole interactions between different molecules. Because of these interactions, the classic Landau-Zener-Stückelberg theory proves inadequate, as does another widely used model constructed by Kayanuma. 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 attributed to the neglect of short-range correlations between the dipolar magnetic fields seen by the molecular spins. The simulations and the kinetic equation both provide a good understanding of the distribution of these dipolar fields, although analytic expressions for the final magnetization remain elusive.

Original languageEnglish (US)
Pages (from-to)37-56
Number of pages20
JournalAnnals of Physics
StatePublished - May 1 2015


  • Kinetic equation
  • Magnetic relaxation
  • Molecular magnet
  • Monte Carlo method
  • Swept field

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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