Dynamic Correlation Length Growth in Superspin Glass: Bridging Experiments and Simulations

Sawako Nakamae (1) , Emmanuelle Dubois (2) , Vincent Dupuis (2) , Denis L'Hôte (1) , Régine Perzynski (2) , Youssef Tahri (1) , Caroline Crauste-Thibierge (1) , Eric Vincent (1)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 PECSA - Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques

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.

Mots clés: spin glass; superspin glass; magnetic nanoparticles; slow dynmaics

Domaines: Autre [cond-mat.other]

Sawako Nakamae, Emmanuelle Dubois, Vincent Dupuis, Denis L'Hôte, Régine Perzynski, et al.. Dynamic Correlation Length Growth in Superspin Glass: Bridging Experiments and Simulations. 2012. ⟨hal-00737568⟩