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

TL;DR

This study investigates the out-of-equilibrium dynamics of superspin glasses in frozen ferrofluids, comparing experimental results with simulations and atomic spin glasses to understand correlation length growth.

Contribution

It bridges experimental magnetization relaxation data with simulations, revealing similarities between superspin glasses and atomic spin glasses at certain scales.

Findings

Superspin correlation lengths estimated via magnetization relaxation.

Dynamic correlations in superspin glasses resemble those in atomic spin glasses.

Texturation affects the out-of-equilibrium dynamics of superspin glasses.

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.