Nonequilibrium magnetic properties in a two-dimensional kinetic mixed Ising system within the effective-field theory and Glauber-type stochastic dynamics approach

Mehmet Ertaş, Bayram Deviren, and Mustafa Keskin
Phys. Rev. E 86, 051110 – Published 7 November 2012

Abstract

Nonequilibrium magnetic properties in a two-dimensional kinetic mixed spin-2 and spin-5/2 Ising system in the presence of a time-varying (sinusoidal) magnetic field are studied within the effective-field theory (EFT) with correlations. The time evolution of the system is described by using Glauber-type stochastic dynamics. The dynamic EFT equations are derived by employing the Glauber transition rates for two interpenetrating square lattices. We investigate the time dependence of the magnetizations for different interaction parameter values in order to find the phases in the system. We also study the thermal behavior of the dynamic magnetizations, the hysteresis loop area, and dynamic correlation. The dynamic phase diagrams are presented in the reduced magnetic field amplitude and reduced temperature plane and we observe that the system exhibits dynamic tricritical and reentrant behaviors. Moreover, the system also displays a double critical end point (B), a zero-temperature critical point (Z), a critical end point (E), and a triple point (TP). We also performed a comparison with the mean-field prediction in order to point out the effects of correlations and found that some of the dynamic first-order phase lines, which are artifacts of the mean-field approach, disappeared.

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  • Received 9 July 2012

DOI:https://doi.org/10.1103/PhysRevE.86.051110

©2012 American Physical Society

Authors & Affiliations

Mehmet Ertaş1, Bayram Deviren2, and Mustafa Keskin1,*

  • 1Department of Physics, Erciyes University, 38039 Kayseri, Turkey
  • 2Department of Physics, Nevsehir University, 50300 Nevşehir, Turkey

  • *Corresponding author: keskin@erciyes.edu.tr

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Vol. 86, Iss. 5 — November 2012

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