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

被引：90

作者：

Vincent, E ^{[1
]}

Dupuis, V ^{[1
]}

Alba, M ^{[1
]}

Hammann, J ^{[1
]}

Bouchaud, JP ^{[1
]}

机构：

[1] CEA Saclay, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

来源：

EUROPHYSICS LETTERS | 2000年 / 50卷 / 05期

关键词：

D O I：

10.1209/epl/i2000-00323-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 chi, in both the ferromagnetic and spin-glass phases of a CdCr1.9In0.1S4 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 Ly 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 spill-glasses is dominated by such wall reconformation processes.

引用

页码：674 / 680

页数：7

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