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

Abstract

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.

12 pages with 4 figures included

References in corpus (5)

• Spin glass behavior in an interacting gamma-Fe2O3 nanoparticle system
• Nonequilibrium spin glass dynamics from picoseconds to 0.1 seconds
• Observation of superspin glass state in magnetically textured ferrofluid (gamma-Fe2O3)
• Growth of a dynamical correlation length in an aging superspin glass
• Anisotropy-axis orientation effect on the magnetization of γ-Fe2O3 frozen ferrofluid

Cited by in corpus (10)

• Matching microscopic and macroscopic responses in glasses
• Spin glasses : experimental signatures and salient outcomes
• Testing statics-dynamics equivalence at the spin-glass transition in three dimensions
• An experiment-oriented analysis of 2D spin-glass dynamics: a twelve time-decades scaling study
• Spin glass experiments
• Nature of the spin-glass phase in dense packings of Ising dipoles with random anisotropy axes
• Phase diagram for ensembles of random close packed Ising-like dipoles as a function of texturation
• Spin-glass dynamics: experiment, theory and simulation
• Magnetic ordering of random dense packings of freely rotating dipoles
• Role of positional disorder in fully textured ensembles of Ising-like dipoles