https://doi.org/10.1140/epjb/e2002-00257-y
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 vincent@drecam.saclay.cea.fr
Received:
6
March
2002
Revised:
14
June
2002
Published online:
17
September
2002
We have studied the slow dynamics of the ferromagnetic phases of the re-entrant
CdCr
In
S4 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
