G. M. Buendia

Numerical study of a mixed Ising ferrimagnetic system

We present a study of a classical ferrimagnetic model on a square lattice in which the two interpenetrating square sublattices have spins one-half and one. This model is relevant for understanding bimetallic molecular ferrimagnets that are currently being synthesized by several experimental groups. We perform exact ground-state calculations for the model, and employ Monte Carlo and numerical transfer-matrix techniques to obtain the finite-temperature phase diagram for both the transition and compensation temperatures. When only nearest-neighbour interactions are included, our non-perturbative results indicate no compensation point or tricritical point at finite temperature, which contradicts earlier results obtained with mean-field analysis.

KINETICS OF A MIXED ISING FERRIMAGNETIC SYSTEM

We present a study, within a mean-field approach, of the kinetics of a classical mixed Ising ferrimagnetic model on a square lattice, in which the two interpenetrating square sublattices have spins

Monte Carlo simulation of a mixed spin 2 and spin Ising ferrimagnetic system

\ensuremath{\sigma}=\ifmmode\pm\else\textpm\fi{}1/2

Decay of metastable phases in a model for the catalytic oxidation of CO.

and

Response of a catalytic reaction to periodic variation of the CO pressure: increased CO2 production and dynamic phase transition.

S=\ifmmode\pm\else\textpm\fi{}1,0.

Numerical Study of a Three‐Dimensional Mixed Ising Ferrimagnet in the Presence of an External Field

The kinetics is described by a Glauber-type stochastic dynamics in the presence of a time-dependent oscillating external field and a crystal field interaction. We can identify two types of solutions: a symmetric one, where the total magnetization

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

M

Magnetic behavior of a mixed Ising ferrimagnetic model in an oscillating magnetic field

oscillates around zero, and an antisymmetric one where

Mass media and heterogeneous bounds of confidence in continuous opinion dynamics

M

Low-temperature nucleation in a kinetic Ising model under different stochastic dynamics with local energy barriers

oscillates around a finite value different from zero. There are regions of the phase space where both solutions coexist. The dynamical transition from one regime to the other can be of first or second order depending on the region in the phase diagram. Depending on the value of the crystal field we found up to two dynamical tricritical points where the transition changes from continuous to discontinuous. Also, we perform a similar study on the Blume-Capel