Short-Time Dynamics of Fe2/V13 Magnetic Superlattice Models

TL;DR

This study investigates the short-time critical dynamics of Fe2/V13 magnetic superlattice models, revealing how variations in exchange coupling ratios affect their dynamic behavior and phase transition characteristics.

Contribution

It provides the first detailed analysis of how changing the interlayer to intralayer exchange ratio influences the short-time dynamics of Fe2/V13 superlattice models.

Findings

Small decrease in exchange ratio R does not affect short-time dynamics significantly.

Significant decrease to R=0.01 alters dynamic behavior, indicating a transition to quasi-two-dimensional magnetism.

Abstract

Critical relaxation from a low-temperature fully ordered state of Fe2/V13 iron-vanadium magnetic superlattice models has been studied using the method of short-time dynamics. Systems with three variants of the ratio R of inter- to intralayer exchange coupling have been considered. Particles with N = 262144 spins have been simulated with periodic boundary conditions. Calculations have been performed using the standard Metropolis algorithm of the Monte Carlo method. The static critical exponents of magnetization and correlation radius, as well as the dynamic critical exponent, have been calculated for three R values. It is established that a small decrease in the exchange ratio (from R = 1.0 to 0.8) does not significantly influence the character of the short-time dynamics in the models studied. A further significant decrease in this ratio (to R = 0.01), for which a transition from three-dimensional to quasi-twodimensional magnetism is possible, leads to significant changes in the dynamic behavior of iron-vanadium magnetic superlattice models.