Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-08-02
Europhys. Lett. 50, 674 (2000)
Physics
Condensed Matter
Disordered Systems and Neural Networks
SPEC, CEA Saclay, 91191 Gif sur Yvette Cedex, France, to appear in Europhys. Lett. (2000)
Scientific paper
10.1209/epl/i2000-00323-8
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.
Alba Michel
Bouchaud Jean-Philippe
Dupuis Véronique
Hammann Jacques
Vincent Edith
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