Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System"
Abstract
In Phys. Rev. Lett. 91 167206 (2003), Sun et al. study memory effects in an interacting nanoparticle system with specific temperature and field protocols. The authors claim that the observed memory effects originate from spin-glass dynamics and that the results are consistent with the hierarchical picture of the spin-glass phase. In this comment, we argue their claims premature by demonstrating that all their experimental curves can be reproduced qualitatively using only a simplified model of isolated nanoparticles with a temperature dependent distribution of relaxation times.
Cite
@article{arxiv.cond-mat/0311264,
title = {Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System"},
author = {M. Sasaki and P. E. Jönsson and H. Takayama and P. Nordblad},
journal= {arXiv preprint arXiv:cond-mat/0311264},
year = {2009}
}
Comments
1 page, 2 figures, slightly changed content, the parameters involved in Figs. 1 and 2 are changed a little for a semi-quantitative comparision with experimental results