A Theory for Spin Glass Phenomena in Interacting Nanoparticle Systems
Disordered Systems and Neural Networks
2007-05-23 v1
Abstract
Dilute magnetic nanoparticle systems exhibit slow dynamics [1] due to a broad distribution of relaxation times that can be traced to a correspondingly broad distribution of particle sizes [1]. However, at higher concentrations interparticle interactions lead to a slow dynamics that is qualitatively indistinguishable from that dislayed by atomic spin glasses. A theory is derived below that accounts quantitatively for the spin-glass behaviour. The theory predicts that if the interactions become too strong the spin glass behaviour disappears. This conclusion is in agreement with preliminary experimental results.
Keywords
Cite
@article{arxiv.cond-mat/0608696,
title = {A Theory for Spin Glass Phenomena in Interacting Nanoparticle Systems},
author = {Derek Walton},
journal= {arXiv preprint arXiv:cond-mat/0608696},
year = {2007}
}