Europhys. Lett.
Volume 62, Number 5, June 2003
Page(s) 664 - 670
Section General
Published online 01 May 2003
DOI: 10.1209/epl/i2003-00425-9
Europhys. Lett., 62 (5) , pp. 664-670 (2003)

Scaling of the magnetic linear response in phase-ordering kinetics

M. Henkel1, M. Paeßens1, 2 and M. Pleimling3

1  Laboratoire de Physique des Matériaux (Laboratoire associé au CNRS UMR 7556.) , Université Henri Poincaré Nancy I B.P. 239, F-54506 Vandoeuvre lès Nancy Cedex, France
2  Institut für Festkörperforschung (Theorie II), Forschungszentrum Jülich D-52425 Jülich, Germany
3  Institut für Theoretische Physik I, Universität Erlangen-Nürnberg D-91058 Erlangen, Germany

(Received 25 November 2002; accepted in final form 7 April 2003)

The scaling of the thermoremanent magnetization and of the dissipative part of the non-equilibrium magnetic susceptibility is analysed as a function of the waiting time s for a simple ferromagnet undergoing phase-ordering kinetics after a quench into the ferromagnetically ordered phase. Their scaling forms describe the crossover between two power law regimes governed by the non-equilibrium exponents a and $\lambda_R/z$, respectively. A relation between a, the dynamical exponent z and the equilibrium exponent $\eta$ is derived from scaling arguments. Explicit tests in the Glauber-Ising model and the kinetic spherical model are presented.

05.70.Ln - Nonequilibrium and irreversible thermodynamics.
75.40.Gb - Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.).
64.60.Ht - Dynamic critical phenomena.

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