Magnetic behavior of a mixed Ising 3/2 and 5/2 spin model

Abstract

We perform Monte Carlo simulations in order to study the magnetic properties of the mixed spin-S = ± 3/2, ± 1/2 and spin-σ = ± 5/2, ± 3/2, ± 1/2 Ising model. The spins are alternated on a square lattice such that S and σ are nearest neighbors. We found that when the Hamiltonian includes antiferromagnetic interactions between the S and σ spins, ferromagnetic interactions between the spins S, and a crystal field, the system presents compensation temperatures in a certain range of the parameters. The compensation temperatures are temperatures below the critical point where the total magnetization is zero, and they have important technological applications. We calculate the finite-temperature phase diagrams of the system. We found that the existence of compensation temperatures depends on the strength of the ferromagnetic interaction between the S spins.

Ground state phase diagrams for the mixed Ising 2 and 5/2 spin model

“…Around the multiphase points may emerge abundant critical phenomena, such as first order phase transitions and tricritical points [10,11]. Furthermore, the exact calculation of the ground state energies can check the reliability of the results of the numerical simulation, as shown by Monte Carlo studies of Wei et al on critical phenomena in a spin (1, 3/2) Ising model in a cubic lattice [11] and De La Espriella and Buendía, on the magnetic behavior of a spins (3/2, 5/2) model, where they found that the ground state magnetizations of the system match with those obtained at T ¼0 in phase diagrams at finite temperature [12].…”

Dynamic hysteresis behaviors for the two-dimensional mixed spin (2, 5/2) ferrimagnetic Ising model in an oscillating magnetic field

“…The phenomenon of ferrimagnetism has been one of the intensively studied subjects in condensed matter physics and statistical mechanics, because of their potential device applications in technologically important materials [2]. Moreover, the mixed spin (2, 5/2) Ising system is the prototypical system that has been used for studying the magnetic behaviors of molecular-based magnetic materials, such as AFe II Fe III (C 2 O 4 ) 3 [A = N(nÀCnH 2n+1 ) 4 , n = 3-5] [3][4][5][6][7][8][9][10][11][12]. Therefore, the purpose of this paper is to extend the work of Ref.…”

Estudio Monte Carlo de un Ferrimagneto de Ising Mixto con Diferentes Anisotropías

“…Los modelos de Ising mixtos juegan un papel importante en la simulación de dichas propiedades (Keskin y Polat, 2009;Behera et al, 2009). Se han realizado, por diversos métodos, diferentes estudios sobre estos modelos compuestos por dos o más subredes de espines mixtos (De La Espriella y Buendía, 2011;De La Espriella y Buendía, 2010;Deviren y Keskin, 2010;Yessoufou et al, 2009;Albayrak e Yigit, 2007;Buendía y Villarroel, 2007;Zhang et al, 2005;Htoutou et al, 2004;Zaim et al, 2009;Ekiz, 2008;Ekiz, 2005;Albayrak e Yigit, 2006).…”

“…Es importante establecer que estas propiedades son características del modelo, y no un resultado de la aproximación que se usa. Existen casos de algunos modelos, donde las aproximaciones de campo medio predicen la existencia de puntos de compensación, en los que simulaciones posteriores con métodos no perturbativos (Monte Carlo) han demostrado que no los poseen (Figueiredo et al, 2004;De La Espriella y Buendía, 2011).…”