Aging in a Two-Dimensional Ising Model with Dipolar Interactions

Details Aging in a Two-Dimensional Ising Model with Dipolar Interactions Aging in a Two-Dimensional Ising Model with Dipolar Interactions

1998-05-25

arxiv.org/abs/cond-mat/9805326v2

Physics

Condensed Matter

Statistical Mechanics

4 pages, RevTex, 5 postscript figures; acknowledgment added and some grammatical corrections in captions

Scientific paper

10.1103/PhysRevB.58.R8885

Aging in a two-dimensional Ising spin model with both ferromagnetic exchange and antiferromagnetic dipolar interactions is established and investigated via Monte Carlo simulations. The behaviour of the autocorrelation function $C(t,t_w)$ is analyzed for different values of the temperature, the waiting time $t_w$ and the quotient $\delta=J_0/J_d$, $J_0$ and $J_d$ being the strength of exchange and dipolar interactions respectively. Different behaviours are encountered for $C(t,t_w)$ at low temperatures as $\delta$ is varied. Our results show that, depending on the value of $\delta$, the dynamics of this non-disordered model is consistent either with a slow domain dynamics characteristic of ferromagnets or with an activated scenario, like that proposed for spin glasses.

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