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The Damage Spreading Method in Monte Carlo Simulations:A Brief Overview and Applications to Confined Magnetic Materials

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Communications in Computational Physics 2008年第7期4卷 207-230页

作者： M.Leticia Rubio Puzzo Ezequiel V.Albano Instituto de Investigaciones Fisicoquimicas Teoricas y Aplicadas(INIFTA) UNLPCONICETCasilla de Correo 16 Sucursal 4(1900)La PlataArgentina

The Damage Spreading(DS)method allows the investigation of the effect caused by tiny perturbations,in the initial conditions of physical systems,on their final stationary or equilibrium *** damage(D(t))is determined during the dynamic evolution of a physical system and measures the time dependence of the difference between a reference(unperturbed)configuration and an initially perturbed *** this paper we first give a brief overview of Monte Carlo simulation results obtained by applying the DS *** model systems under study often exhibit a transition between a state where the damage becomes healed(the frozen phase)and a regime where the damage spreads arriving at a finite(stationary)value(the damaged phase),when a control parameter is finely *** kinds of transitions are actually true irreversible phase transitions themselves,and the issue of their universality class is also ***,the attention is focused on the propagation of damage in magnetic systems placed in confined *** influence of interfaces between magnetic domains of different orientation on the spreading of the perturbation is also discussed,showing that the presence of interfaces enhances the propagation of the ***,the critical transition between propagation and nonpropagation of the damage is *** all cases,the determined critical exponents suggest that the DS transition does not belong to the universality class of Directed Percolation,unlike many other systems exhibiting irreversible phase *** result reflects the dramatic influence of interfaces on the propagation of perturbations in magnetic systems.

关键词： propagation of perturbations phase transitions and critical phenomena magnetic systems in confined geometries.

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