Phase diagrams of a Spin-1 Ising Superlattice

TL;DR

This study explores the complex phase diagrams of a three-dimensional spin-1 Ising superlattice, revealing multicritical points and reentrant behaviors influenced by material thicknesses, using mean field approximation.

Contribution

It provides a detailed analysis of phase diagrams for a spin-1 Ising superlattice considering varying crystal fields and thicknesses, highlighting their impact on magnetic states.

Findings

Presence of multicritical points in phase diagrams

Reentrant and double reentrant behaviors observed

Phase diagram features depend on superlattice thicknesses

Abstract

The three-dimensional spin-1 Ising superlattice consisting of two different ferromagnetic materials with two different crystal fields $\Delta_1$ and $\Delta_2$ is considered in the mean field approximation. The phase diagrams are considered in the (t,$d_2$) plane for different ranges of variation of $d_1$ (t=T/J, $d_1$/J and $d_2$/J are the reduced temperature and crystal fields respectively). The phase diagrams exhibit a variety of multicritical points and reentrant and double reentrant behaviours. They are found to depend qualitatively and/or quantitatively on the thicknesses of the materials in a supercell. This has direct consequences on the nature of the magnetic states of superlattices with different thicknesses.