Monte Carlo simulations of dynamic phase transitions in ultrathin Blume-Capel films

TL;DR

This paper uses Monte Carlo simulations to study dynamic phase transitions in ultrathin Blume-Capel films, revealing how film parameters influence hysteresis and critical behavior.

Contribution

It provides new insights into the effects of surface modifications and frequency on dynamic phase transitions in ultrathin magnetic films.

Findings

Hysteresis loop area follows a power law at low and moderate frequencies.

Critical coupling of the surface is identified where transition temperature is thickness-independent.

Dynamic correlation between magnetization and external field varies with system parameters.

Abstract

Dynamic phase transition phenomena in ultrathin films described by Blume-Capel model have been investigated using Monte Carlo simulations. Hysteresis loops, micromagnetic structures, and hysteresis loop area curves, as well as dynamic correlation between the magnetization and the external field have been studied as functions of the field, as well as the film parameters. The variation of critical coupling of the modified film surface at which the transition temperature becomes independent of film thickness have been clarified for varying system parameters. Frequency dispersion of hysteresis loop area have been found to obey a power law for low and moderate frequencies for both ordinary and enhanced surfaces.