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We compare aging in a disordered ferromagnet and in a spin glass, by studyingthe different phases of a reentrant system. We have measured the relaxation ofthe low-frequency ac susceptibility, in both the ferromagnetic and spin-glassphases of a CdCr_{1.9}In_{0.1}S_4 sample. A restart of aging processes when thetemperature is lowered (`chaos-like' effect) is observed in both phases. Thememory of previous aging at a higher temperature can be retrieved uponre-heating, but in the ferromagnetic phase it can rapidly be erased by thegrowth of ferromagnetic domains. We interpret the behaviour observed in theferromagnetic phase in terms of a combination of domain growth and pinned wallreconformations, and suggest that aging in spin glasses is dominated by suchwall reconformation processes.Comment: SPEC, CEA Saclay, 91191 Gif sur Yvette Cedex, France, to appear in  Europhys. Lett. (2000

Aging phenomena in spin-glass and ferromagnetic phases: Domain growth and wall dynamics