Phase transitions in random magnetic bilayer

TL;DR

This paper investigates how random interlayer exchange affects phase transitions in a bilayer Ising magnetic system, revealing the existence of ferromagnetic, antiferromagnetic, and ferrimagnetic phases with detailed phase diagrams.

Contribution

It introduces a model of a bilayer Ising system with random interlayer exchange and analyzes its phase states and diagrams, which was not previously explored.

Findings

The system can exist in three magnetic phases: ferromagnetic, antiferromagnetic, and ferrimagnetic.

Phase diagrams and temperature dependencies of thermodynamic parameters are characterized.

Magnetic phase regions under external magnetic fields at zero temperature are identified.

Abstract

The influence of random interlayer exchange on the phase states of the simplest magnetic heterostructure consisting of two ferromagnetic Ising layers with large interaction radius is studied. It is shown that such system can exist in three magnetic phases: ferromagnetic, antiferromagnetic and ferrimagnetic. The possible phase diagrams and temperature dependencies of thermodynamic parameters are described. The regions of existence of the magnetic phases in external magnetic field are determined at zero temperature.