Thermal and magnetic phase transition properties of a binary alloy spherical nanoparticle: A Monte Carlo simulation study

TL;DR

This study uses Monte Carlo simulations to analyze how the size and composition of a binary alloy spherical nanoparticle influence its thermal and magnetic phase transitions, revealing controllable critical behaviors.

Contribution

First detailed Monte Carlo analysis of binary alloy spherical nanoparticles' phase transitions considering size and composition effects.

Findings

Phase diagrams depend on nanoparticle radius and composition.

Magnetic and thermal transition temperatures can be tuned via system parameters.

Critical behaviors are controllable through Hamiltonian adjustments.

Abstract

We have used the Monte Carlo (MC) simulation method with Metropolis algorithm to study the finite temperature phase transition properties of a binary alloy spherical nanoparticle with radius $r$ of the type $A_{p}B_{1-p}$. The system consists of two different species of magnetic components, namely, $A$ and $B$, and the components of the system have been selected $A$ and $B$ to be as $\sigma = 1/2$ and $S=1$, respectively. A complete picture of phase diagrams, total magnetizations and susceptibilities in related planes have been presented, and the main roles of the radius of nanoparticle, active concentration value of type-$A$ atoms as well as other system parameters on the thermal and magnetic phase transition features of the considered system have been discussed in detail. Our MC investigations clearly show that it is possible to control the critical characteristic behaviors of the system with the help of adjustable Hamiltonian parameters.