Aging phenomena in spin glass and ferromagnetic phases: domain growth and wall dynamics
Abstract
We compare aging in a disordered ferromagnet and in a spin glass, by studying the different phases of a reentrant system. We have measured the relaxation of the low-frequency ac susceptibility, in both the ferromagnetic and spin-glass phases of a CdCr_{1.9}In_{0.1}S_4 sample. A restart of aging processes when the temperature is lowered (`chaos-like' effect) is observed in both phases. The memory of previous aging at a higher temperature can be retrieved upon re-heating, but in the ferromagnetic phase it can rapidly be erased by the growth of ferromagnetic domains. We interpret the behaviour observed in the ferromagnetic phase in terms of a combination of domain growth and pinned wall reconformations, and suggest that aging in spin glasses is dominated by such wall reconformation processes.
Cite
@article{arxiv.cond-mat/9908030,
title = {Aging phenomena in spin glass and ferromagnetic phases: domain growth and wall dynamics},
author = {E. Vincent and V. Dupuis and M. Alba and J. Hammann and J. -P. Bouchaud},
journal= {arXiv preprint arXiv:cond-mat/9908030},
year = {2009}
}
Comments
SPEC, CEA Saclay, 91191 Gif sur Yvette Cedex, France, to appear in Europhys. Lett. (2000)