Interacting magnetic nanoparticles display a wide variety of magnetic behaviors that are now being gathered in the emerging field of 'supermagnetism.' We have investigated how the out-of-equilibrium dynamics in the disordered superspin glass (SSG) state of a frozen ferrofluid sample is affected by texturation. Via magnetization relaxation experiments at low temperatures, we were able to estimate superspin correlation lengths for both textured and non-textured samples. The comparison with simulations and experiments on atomic spin glasses shows that the dynamic correlations in SSG's appear to develop in a way reminiscent to those in atomic spin glasses at intermediate time/length scales.
@article{arxiv.1210.2524,
title = {Dynamic Correlation Length Growth in Superspin Glass: Bridging Experiments and Simulations},
author = {Sawako Nakamae and Caroline Crauste-Thibierge and Denis L'Hote and Eric Vincent and Emmanuelle Dubois and Vincent Dupuis and Regine Perzynski},
journal= {arXiv preprint arXiv:1210.2524},
year = {2015}
}