Aging in a two-dimensional Ising model with dipolar interactions

Article

关键词: SPIN-GLASS;    RELAXATION;    BEHAVIOR;   

DOI  :  10.1103/PhysRevB.58.R8885

来源: SCIE

【 摘 要 】

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 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. Our results show that this nondisordered model presents a slow nonequilibrium dynamics which, depending on the values of delta, is consistent either with a linear scaling tit,, of the correlation function or with a logaritmic scaling In(t)/In(t(w)) which is usually associated with activated dynamics scenarios in disordered systems. [S0163-1829(98)50138-5].

【 授权许可】

Free