Thermodynamic behaviour of magnetocaloric quantities in spin-1/2 Ising square trilayer

TL;DR

This study uses Monte Carlo simulations to analyze the thermodynamic behavior of magnetocaloric quantities in a spin-1/2 Ising trilayer system, revealing how interaction variations affect phase transitions and magnetocaloric properties.

Contribution

It introduces a novel mathematical description of magnetocaloric behavior in trilayer systems, aiding the design of materials with tailored magnetocaloric effects.

Findings

Variation in interaction strengths shifts compensation and critical points.

Proposed mathematical relations describe magnetocaloric quantities' dependence on parameters.

Phase diagrams were obtained for different layer configurations.

Abstract

A spin-1/2, Ising trilayered ferrimagnetic system on square Bravais lattice is studied, employing Monte-Carlo simulation with the single spin-flip Metropolis algorithm. The bulk of such a system is formed by three layers, each of which is composed entirely either by A or B type of atoms, resulting in two distinct compositions: ABA and AAB and two different types of magnetic interactions: ferromagnetic between like atoms and antiferromagnetic between unlike atoms. For such systems, Inverse Absolute of Reduced Residual Magnetisation is the absolute value of the ratio of the extremum of the magnetisation in between compensation and critical points and the saturation magnetisation. Variation of relative interaction strengths in the Hamiltonian, for a range of values, leads to the shift of compensation point and critical point and changes in the magnitude of Inverse absolute of Reduced Residual magnetisation. Probable mathematical forms of dependences of the Inverse absolute of Reduced Residual magnetisation and temperature interval between the compensation and critical points on controlling parameters were proposed in the absence of applied magnetic field and have obtained phase diagrams for both types of configurations from these relations. This alternative description of the simulated systems may help technologists design magnetocaloric materials according to desired characteristics.