Growth of a dynamical correlation length in an aging superspin glass

Abstract

We report on zero field cooled magnetization relaxation experiments on a concen- trated frozen ferrofluid exhibiting a low temperature superspin glass transition. With a method initially developed for spin glasses, we investigate the field dependence of the relaxations that take place after different aging times. We extract the typical number of correlated spins involved in the aging dynamics. This brings important insights into the dynamical correlation length and its time growth. Our results, consistent with expressions obtained for spin glasses, extend the generality of these behaviours to the class of superspin glasses. Since the typical flipping time is much larger for superspins than for atomic spins, our experiments probe a time regime much closer to that of numerical simulations.

References in corpus (4)

• Spatial correlations in the dynamics of glassforming liquids: Experimental determination of their temperature dependence
• Spontaneous and induced dynamic fluctuations in glass-formers I: General results and dependence on ensemble and dynamics
• Spin glass behavior in an interacting gamma-Fe2O3 nanoparticle system
• Growing dynamical length, scaling and heterogeneities in the 3d Edwards-Anderson model

Cited by in corpus (4)

• Observation of superspin glass state in magnetically textured ferrofluid (gamma-Fe2O3)
• On the Slowing Down of Spin Glass Correlation Length Growth:simulations meet experiments
• Real spin glasses relax slowly in the shade of hierarchical trees
• Superspin glass aging behavior in textured and nontextured frozen ferrofluid