Aging, rejuvenation and memory effects in re-entrant ferromagnets
Service de Physique de l'État Condensé, DRECAM, DSM, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
Corresponding author: a email@example.com
Revised: 14 June 2002
Published online: 17 September 2002
We have studied the slow dynamics of the ferromagnetic phases of the re-entrant CdCrInS4 system for by means of low frequency ac susceptibility and magnetization measurements. Experimental procedures widely used in the investigation of the out-of-equilibrium dynamics of spin glasses (such as the x=0.85 compound) have been applied to search for aging, rejuvenation and memory effects, and to test their dependence on the disorder introduced by dilution of the magnetic ions. Whereas the rejuvenation effect is found in all studied samples, the memory effect is clearly enhanced for increasing dilutions. The results support a description of aging in both ferromagnetic and re-entrant spin-glass phases in terms of hierarchical reconformations of domain walls pinned by the disorder.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.50.Lk – Spin glasses and other random magnets
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002