Phenomenes de vieillissement, rajeunissement et memoire: l'exemple des verres de spin

TL;DR

This paper explores aging, rejuvenation, and memory effects in disordered magnetic systems called spin glasses, drawing parallels with other disordered materials and proposing a combined description of these phenomena.

Contribution

It introduces a unified framework to describe aging, rejuvenation, and memory effects in spin glasses and related disordered systems, emphasizing temperature-selective and cumulative processes.

Findings

Spin glasses exhibit aging, rejuvenation, and memory effects under magnetic and temperature variations.

Comparable phenomena are observed in polymers and gels, though less sharply.

A combined model of temperature-selective and cumulative effects explains these phenomena.

Abstract

The spin glasses are disordered and frustrated magnetic systems. They show aging phenomena which are also a characteristic feature of structural glasses, polymers, dielectrics, colloids, etc. Under a strong enough magnetic field variation, spin glasses can be "rejuvenated", in the same way as glasses under a high enough stress. But spin glasses also display non-trivial "rejuvenation and memory" effects when they are submitted to temperature variations. Comparable phenomena have recently been identified in some polymers and gels, although less sharply pronounced. We propose to describe aging phenomena in disordered systems in terms of a combination of such "temperature-selective" effects with the more usual "temperature-cumulative" processes related to strong cooling rate effects.