Dynamic magnetic behavior of the mixed-spin bilayer system in an oscillating field within the mean-field theory

The dynamic magnetic behavior of the mixed Ising bilayer system (sigma = 2 and S = 5/2), with a crystal-field interaction in an oscillating field are studied, within the mean-field approach, by using the Glauber-type stochastic dynamics for both ferromagnetic/ferromagnetic and antiferromagnetic/ferromagnetic interactions. The time variations of average magnetizations and the temperature dependence of the dynamic magnetizations are investigated. The dynamic phase diagrams are presented in the reduced temperature and magnetic field amplitude plane and they exhibit several ordered phases, coexistence phase regions and critical points as well as a re-entrant behavior depending on interaction parameters. (c) 2012 Elsevier B.V. All rights reserved.