Aging in a two-dimensional Ising model with dipolar interactions

JULIO H. TOLOZA; FRANCISCO TAMARIT; SEGIO CANNAS

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 1998 vol. 58

1098-0121

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 behavior of the autocorrelation function is analyzed for different values of the temperature, the waiting time and the quotient between the strength of the exchange and the long-range interaction. Our results show that this nondisordered model presents a slow nonequilibrium dynamics which, depending on the values of parameters, is consistent either with a linear scaling of the correlation function or with a logaritmic scaling, which is usually associated with activated dynamics scenarios in disordered systems.