Critical behavior and universality properties of uniaxial ferromagnetic thin films in the presence of random magnetic fields

Abstract

Critical phenomena in uniaxial ferromagnetic thin films in the presence of random magnetic fields have been studied within the framework of effective field theory. When the type of the random field distribution is bimodal, the system exhibits tricritical behavior. Furthermore, the critical value of surface to bulk ratio of exchange interactions at which the transition temperature becomes independent of film thickness varies very slowly in the presence of both bimodal or trimodal random fields. Regarding the universality properties, neither p, nor h variations in the system can affect the value of the shift exponent λ. In this regard, it can be concluded that pure ferromagnetic thin films are in the same universality class with those under the influence of random discrete magnetic fields.