Phase transitions in a ferrimagnetic Heisenberg multilayer: a Monte Carlo study

Abstract Using a Monte Carlo method, the magnetic properties of a Heisenberg multilayer system consisting of four alternating ferromagnetic layers (A and B) with different spins and interaction constants are examined. The effects of sampling size, antiferromagnetic interlayer coupling ( J AB ) and disordered interfaces on the specific heat and magnetisation thermal variation are investigated. For multilayers with steep interfaces, it is shown that the thermal variation of the specific heat exhibits two peaks, but only a single-phase transition occurs. The transition temperature is independent on J AB in the investigated range. On the other hand, this temperature depends on the kind of the interfaces.