Comparing aging phenomena in the spin glass and ferromagnetic phases of a reentrant system
Abstract
We compare slow domain growth aging in a disordered ferromagnet and aging in a spin glass, by studying the different phases of a reentrant system. We measure 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' 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 is rapidly erased by the growth of ferromagnetic domains. We interpret the `spin-glass like' behaviour observed in the ferromagnetic phase in terms of pinned domain wall reconformations, and discuss how this picture might extend to spin-glasses.Keywords
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