Dynamics of domains in diluted antiferromagnets

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1996
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Esser, J.
Usadel, Klaus-Dieter
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Physica A: Statistical Mechanics and its Applications. 1996, 232(1-2), pp. 40-50. Available under: doi: 10.1016/0378-4371(96)00133-1
Zusammenfassung

We investigate the dynamics of two-dimensional site-diluted Ising antiferromagnets. In an external magnetic field these highly disordered magnetic systems have a domain structure which consists of fractal domains with sizes on a broad range length scales. We focus on the dynamics of these systems during the relaxation from a long-range ordered initial state to the disordered fractal-domain state after applying an external magnetic field. The equilibrium state with applied field consists of fractal domains with a size distribution which follows a power law with an exponential cutoff. The dynamics of the systems can be understood as a growth process of this fractal-domain state in such a way that the equilibrium distribution of domains develops during time. Following these ideas quantitatively we derive a simple description of the time dependence of the order parameter. The agreement with simulations is excellent.

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530 Physik
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Ising-models, random magnets, dynamics
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ISO 690NOWAK, Ulrich, J. ESSER, Klaus-Dieter USADEL, 1996. Dynamics of domains in diluted antiferromagnets. In: Physica A: Statistical Mechanics and its Applications. 1996, 232(1-2), pp. 40-50. Available under: doi: 10.1016/0378-4371(96)00133-1
BibTex
@article{Nowak1996Dynam-5340,
  year={1996},
  doi={10.1016/0378-4371(96)00133-1},
  title={Dynamics of domains in diluted antiferromagnets},
  number={1-2},
  volume={232},
  journal={Physica A: Statistical Mechanics and its Applications},
  pages={40--50},
  author={Nowak, Ulrich and Esser, J. and Usadel, Klaus-Dieter}
}
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