Surface behavior of magnetic phase transitions: A Monte Carlo study

摘要

In this manuscript, we have studied the magnetic properties of superlattice with simple cubic lattice formed by mixed spin-5/2 in surface and spin-2 in bulk using the Monte Carlo simulations. The ground state of this system is given. The critical temperature has been deduced and discussed. The thermal behaviors of the magnetizations as well as the effect of the different exchange interactions and the crystal field effect, have also been studied. The magnetic hysteresis cycles of such system has been discussed for different values of the exchange interactions between superlattice, for different values of the crystal field and for different temperature values. The effects of the crystal fields, temperatures and the increase in the number of interactions induce greater complexity in the phase diagrams, causing various multiphase points and multiples of hysteresis cycles and allow exploring regions where important magnetic behaviors could arise. (C) 2017 Elsevier B.V. All rights reserved.