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

摘要

We have used the Monte Carlo (MC) simulation method with Metropolis algorithmto study the finite temperature phase transition properties of a binary alloyspherical nanoparticle with radius $r$ of the type $A_{p}B_{1-p}$. The systemconsists 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 beenpresented, and the main roles of the radius of nanoparticle, activeconcentration value of type-$A$ atoms as well as other system parameters on thethermal and magnetic phase transition features of the considered system havebeen discussed in detail. Our MC investigations clearly show that it ispossible to control the critical characteristic behaviors of the system withthe help of adjustable Hamiltonian parameters.