The magnetization relaxation of Mn12 single-molecule magnets (SMMs) does not follow a simple Arrhenius law, even for data collected at low frequencies (5-1500 Hz) due to contributions from relaxation pathways via excited states with larger thermal barriers, but much faster attempt rates. A modified Arrhenius equation is presented as a means to overcome this problem and obtain a more reliable limiting value for the barrier to magnetization relaxation associated with the ground S=10 state.
Cite
@article{arxiv.0906.0812,
title = {A Caveat for Single-Molecule Magnetism: Non-linear Arrhenius Plots},
author = {Christos Lampropoulos and Stephen O. Hill and George Christou},
journal= {arXiv preprint arXiv:0906.0812},
year = {2009}
}