Manifestation of slow dynamics in multilayer nanostructures with different thicknesses of magnetic films

The results of a numerical Monte Carlo study of the behavior of a trilayer nanostructure with magnetization oriented in the film plane with ferromagnetic film thicknesses $N = 3$ and $21$ MLs are presented. The non-equilibrium behavior of the structure has been investigated at the critical temperatures $T_c(N)$ and temperatures $T_c(N)/2$, $T_c(N)/4$, and the time dependence of the autocorrelation function during the evolution from different initial states and the dynamic susceptibility from the high-temperature initial state have been analyzed. Aging effects are revealed in the behavior of the two-temporal characteristics. The asymptotic values of the fluctuation-dissipative ratio for the structures with $N = 3$ and $21$ MLs are calculated which indicate the violation of the fluctuation-dissipative theorem in the non-equilibrium behavior of these structures.