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[en] The effects of two different single-ion anisotropies on the magnetization of the mixed (7/2, 5/2) Ising ferrimagnetic system on a square lattice are investigated by the use of Monte Carlo simulation. The ground-state phase diagram is obtained. Compensation points are detected for certain values of the crystal fields. Different types of magnetization curves are available.
[en] The effects of single-ion anisotropies and an external magnetic field on the magnetization of the mixed-spin (7/2, 3/2) ferrimagnetic Ising system are investigated within Monte Carlo simulation. Under certain values of the physical parameters, multiple hysteresis loop behaviors such as double, triple, and quintuple hysteresis cycles have been observed. Particularly, the superparamagnetic phase has been shown. The ground-state phase diagrams are presented.
[en] By means of the Monte Carlo method, we have simulated the mixed-spin-1/2 and spin-2 Ising ferrimagnetic system on a honeycomb lattice. We studied the variations of the magnetization as functions of the crystal field and the temperature and obtained the phase diagram of the system for various crystal field values. We have found that the system cannot display a point of compensation if we consider only nearest-neighbor interactions and the crystal field effect. Also, the tricritical point does not exist. To the best of our knowledge, this system has never been studied using the Monte Carlo method.
[en] The structural electronic and magnetic properties of Ga doped delafossite CuFe0.96Ga0.04O2 are investigated using first principle calculations and Monte Carlo simulation. The calculations are based on the density functional theory using the Wien2k package within full potential linearized augmented plane wave method and spin-polarized generalized gradient approximation of the exchange-correlation functional. The simulated results show that an ideal Ga doped delafossite is an antiferromagnetic and the magnetic moments of the iron is about . Furthermore, we have explored the spin coupling interactions up to third nearest neighbors as well the coupling between adjacent layers in order to examine the magnetism and thermodynamical properties. In addition, we have reported the magnetic properties of this element using Monte Carlo simulation. The obtained values of the Néel temperature decrease as the absolute value of the single ion anisotropy increases. This result is in fair agreement with experiment.