INVESTIGADORES
TOLOZA Julio Hugo
artículos
Título:
Aging in a two-dimensional Ising model with dipolar Interactions
Autor/es:
JULIO H. TOLOZA; FRANCISCO A. TAMARIT; SERGIO A. CANNAS
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
The American Physical Society
Referencias:
Lugar: College Park, Maryland; Año: 1998 vol. 58 p. 8885 - 8885
ISSN:
0163-1829
Resumen:
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 {f 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.