Glauber dynamics in a single-chain magnet: From theory to real systems

TL;DR

This paper investigates Glauber dynamics in a single-chain magnet, confirming a single relaxation mode and revealing temperature-dependent regimes influenced by magnetic correlations, finite-size effects, and boundary conditions.

Contribution

It provides the first experimental validation of Glauber dynamics in real single-chain magnets, highlighting the role of finite-size effects and boundary conditions.

Findings

Single relaxation mode observed in magnetization.

Thermally activated relaxation time governed by magnetic correlations above 2.7 K.

Crossover to a different relaxation regime below 2.7 K indicating finite-size effects.

Abstract

The Glauber dynamics is studied in a single-chain magnet. As predicted, a single relaxation mode of the magnetization is found. Above 2.7 K, the thermally activated relaxation time is mainly governed by the effect of magnetic correlations and the energy barrier experienced by each magnetic unit. This result is in perfect agreement with independent thermodynamical measurements. Below 2.7 K, a crossover towards a relaxation regime is observed that is interpreted as the manifestation of finite-size effects. The temperature dependences of the relaxation time and of the magnetic susceptibility reveal the importance of the boundary conditions.