Absence of rejuvenation in a Superspin Glass

Abstract

Effects of temperature changes on the nonequilibrium spin-glass dynamics of a strongly interacting ferromagnetic nanoparticle system (superspin glass) are studied. In contrary to atomic spin glasses, strong cooling rate effects are observed, and no evidence for temperature-chaos is found. The flip time of a magnetic moment is much longer than that of an atomic spin and hence much shorter time scales are probed within the experimental time window for a superspin glass than for an atomic spin glass. Within a real space picture the cumulative aging observed for the superspin glass can be explained considering that all investigated length scales are shorter than the temperature-chaos overlap length. The transient relaxation, observed in experiments after temperature changes, can be understood as the adjustment of thermally active droplets, which is mutatis mutandis the Kovacs effect observed in most glassy systems.

arXiv comment8 pages, 7 figures

References in corpus (18)

• Memory and Chaos Effects in Spin Glasses
• Geometrical Aspects of Aging and Rejuvenation in the Ising Spin Glass: A Numerical Study
• Off-Equilibrium Dynamics in Finite-Dimensional Spin Glass Models
• Aging, rejuvenation and memory effects in Ising and Heisenberg spin glasses
• Separation of time and length scales in spin-glasses: temperature as a microscope
• Violation of the Fluctuation Dissipation Theorem in Finite Dimensional Spin Glasses
• Spin Glasses: A Ghost Story
• Critical dynamics of an interacting magnetic nanoparticle system
• Scaling of stiffness energy for 3d +/-J Ising spin glasses
• Non-equilibrium dynamics in an interacting nanoparticle system
• Aging in K${}_{1-x}$Li${}_x$Ta0${}_3$: a domain growth interpretation
• Numerical Study on Aging Dynamics in the 3D Ising Spin-Glass Model. I. Energy Relaxation and Domain Coarsening
• Non-equilibrium dynamics in a 3d spin-glass
• Symmetrical Temperature-Chaos Effect with Positive and Negative Temperature Shifts in a Spin Glass
• Numerical Study on Aging Dynamics in the 3D Ising Spin-Glass Model. II. Quasi-Equilibrium Regime of Spin Auto-Correlation Function
• Deviations from Perfect Memory in Spin Glass Temperature Cycling Experiments
• Numerical Study on Aging Dynamics in the 3D Ising Spin-Glass Model. III. Cumulative Memory and `Chaos' Effects in the Temperature-Shift Protocol
• On temperature chaos in Ising and XY Spin Glasses

Cited by in corpus (8)

• Aging and Memory Effects in Superparamagnets and Superspin Glasses
• Aging phenomena in PMMA thin films -- memory and rejuvenation effects
• Eu${}_{0.5}$Sr${}_{1.5}$MnO${}_4$: a three-dimensional XY spin glass
• Magnetic states and spin-glass properties in Bi0.67Ca0.33MnO3: macroscopic ac measurements and neutron scattering
• Growth of a dynamical correlation length in an aging superspin glass
• "Glassy Dynamics" in Ising Spin Glasses -- Experiment and Simulation
• Elementary transitions and magnetic correlations in two-dimensional disordered nanoparticle ensembles
• Spin-glass like dynamics of ferromagnetic clusters in La${}_{0.75}$Ba${}_{0.25}$CoO${}_3$