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Dynamics of domains in diluted antiferromagnets

Author

Listed:
  • Nowak, U.
  • Esser, J.
  • Usadel, K.D.

Abstract

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.

Suggested Citation

  • Nowak, U. & Esser, J. & Usadel, K.D., 1996. "Dynamics of domains in diluted antiferromagnets," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 232(1), pages 40-50.
    • Handle: RePEc:eee:phsmap:v:232:y:1996:i:1:p:40-50
    DOI: 10.1016/0378-4371(96)00133-1
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    Cited by:

    1. Jost, M. & Usadel, K.D., 1997. "Domain wall roughening in three dimensional magnets at the depinning transition," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 239(4), pages 486-492.

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