Europhys. Lett.
Volume 68, Number 6, December 2004
Page(s) 881 - 887
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 12 November 2004
Europhys. Lett., 68 (6), pp. 881-887 (2004)
DOI: 10.1209/epl/i2004-10276-4

Domain growth in random magnets

R. Paul1, S. Puri2 and H. Rieger1

1  Theoretische Physik, Universität des Saarlandes - 66041 Saarbrücken, Germany
2  School of Physical Sciences, Jawaharlal Nehru University - New Delhi 110067, India

received 23 July 2004; accepted in final form 14 October 2004
published online 12 November 2004

We study the kinetics of domain growth in ferromagnets with random exchange interactions. We present detailed Monte Carlo results for the nonconserved random-bond Ising model, which are consistent with power law growth with a variable exponent. These results are interpreted in the context of disorder barriers with a logarithmic dependence on the domain size. Further, we clarify the implications of logarithmic barriers for both nonconserved and conserved domain growth.

75.40.Gb - Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.).
05.50.+q - Lattice theory and statistics (Ising, Potts, etc.).
75.10.Nr - Spin-glass and other random models.

© EDP Sciences 2004