1999/08/31 by E Vincent, E. Vincent, V Dupuis +7 · 6 citations
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Material Dynamics and Properties #Theoretical and Computational Physics #cond-mat.dis-nn
paper · pdf · doi:10.1209/epl/i2000-00323-8
published as Europhys. Lett. 50, 674 (2000) · SPEC, CEA Saclay, 91191 Gif sur Yvette Cedex, France, to appear in Europhys. Lett. (2000)
arxiv created 2000/03/31 · openalex publication_date 2000/06/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We compare aging in a disordered ferromagnet and in a spin-glass, by studying the different phases of a re-entrant system. We have measured the relaxation of the low-frequency ac susceptibility χ, 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.