Kinetics of a mixed spin-1/2 and spin-3/2 Ising ferrimagnetic model

Abstract

We present a study, within a mean-field approach, of the kinetics of a mixed ferrimagnetic model on a square lattice in which two interpenetrating square sublattices have spins that can take two values, $\sigma =\pm 1/2$, alternated with spins that can take the four values, $S=\pm 3/2,\pm 1/2$. We use the Glauber-type stochastic dynamics to describe the time evolution of the system with a crystal-field interaction in the presence of a time-dependent oscillating external magnetic field. The nature (continuous and discontinuous) of transition is characterized by studying the thermal behaviors of average order parameters in a period. The dynamic phase transition points are obtained and the phase diagrams are presented in the reduced magnetic field amplitude $(h)$ and reduced temperature $(T)$ plane, and in the reduced temperature and interaction parameter planes, namely in the $(h,T)$ and $(d,T)$ planes, $d$ is the reduced crystal-field interaction. The phase diagrams always exhibit a tricritical point in $(h,T)$ plane, but do not exhibit in the $(d,T)$ plane for low values of $h$. The dynamic multicritical point or dynamic critical end point exist in the $(d,T)$ plane for low values of $h$. Moreover, phase diagrams contain paramagnetic $(p)$, ferromagnetic $(f)$, ferrimagnetic $(i)$ phases, two coexistence or mixed phase regions, $(f+p)$ and $(i+p)$, that strongly depend on interaction parameters.

arXiv comment13 pages, 6 figures, submitted to Journal of Magnetism and Magnetic Materials

References in corpus (5)

• Absence of First-order Transition and Tri-critical Point in the Dynamic Phase Diagram of a Spatially Extended Bistable System in an Oscillating Field
• Kinetics of a mixed Ising ferrimagnetic system
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Cited by in corpus (2)

• Magnetic hysteresis in a molecular Ising ferrimagnet: Glauber dynamics approach
• Dynamical phase transition in one-dimensional kinetic Ising model with nonuniform coupling constants