| Issue |
Europhys. Lett.
Volume 50, Number 5, June I 2000
|
|
|---|---|---|
| Page(s) | 674 - 680 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00323-8 | |
| Published online | 01 September 2002 | |
Aging phenomena in spin-glass and ferromagnetic phases: Domain growth and wall dynamics
Service de Physique de l'Etat Condensé, CEA Saclay
91191 Gif-sur-Yvette Cedex, France
Received:
9
August
1999
Accepted:
24
March
2000
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
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.
PACS: 75.50.Lk – Spin-glasses and other random magnets / 75.10.Nr – Spin-glass and other random models / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
© EDP Sciences, 2000
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