Dynamic compensation temperature in the kinetic spin-1 Ising model in an oscillating external magnetic field on alternate layers of a hexagonal lattice

Temizer Ü., KESKİN M., Canko O.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol.321, no.19, pp.2999-3006, 2009 (SCI-Expanded) identifier identifier


The dynamic behaviour of a two-sublattice spin-1 Ising model with a crystal-field interaction (D) in the presence of a time-varying magnetic field on a hexagonal lattice is studied by using the Glauber-type stochastic dynamics. The lattice is formed by alternate layers of spins sigma = 1 and S = 1. For this spin arrangement, any spin at one lattice site has two nearest-neighbor spins on the same sublattice, and four on the other sublattice. The intersublattice interaction is antiferromagnetic. We employ the Glauber transition rates to construct the mean-field dynamical equations. Firstly, we study time variations of the average magnetizations in order to find the phases in the system, and the temperature dependence of the average magnetizations in a period, which is also called the dynamic magnetizations, to obtain the dynamic phase transition (DPT) points as well as to characterize the nature (continuous and discontinuous) of transitions. Then, the behaviour of the total dynamic magnetization as a function of the temperature is investigated to find the types of the compensation behaviour. Dynamic phase diagrams are calculated for both DPT points and dynamic compensation effect. Phase diagrams contain the paramagnetic (p) and antiferromagnetic (af) phases, the p+af and nm+p mixed phases, nm is the non-magnetic phase, and the compensation temperature of the L-type behaviour that strongly depend on the interaction parameters. For D < 2.835 and H-0 > 3.8275, H-0 is the magnetic field amplitude, the compensation effect does not appear in the system. (C) 2009 Elsevier B.V. All rights reserved.