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Oubelkacem A.,Moulay Ismai University | Essaoudi I.,Moulay Ismai University | Ainane A.,Moulay Ismai University | Ainane A.,Max Planck Institute For Physik Complexer Systeme | And 4 more authors.
Physica A: Statistical Mechanics and its Applications | Year: 2010

Using the effective field theory with a probability distribution technique that accounts for the self-spin correlation functions, the magnetic properties of disordered Fe-Al alloys on the basis of a site-diluted quantum Heisenberg spin model are examined. We calculated the critical temperature and the hysteresis loops for this system. We find a number of characteristic phenomena. In particular, the effect of concentration c of magnetic atoms and the reduced exchange anisotropic parameter η on both the critical temperature and magnetization profiles are clarified. © 2010 Elsevier B.V. All rights reserved. Source


Boughrara M.,Laboratoire Physique des Matriaux et Modlisation des Systmes LP2MS | Kerouad M.,Laboratoire Physique des Matriaux et Modlisation des Systmes LP2MS | Saber M.,Laboratoire Physique des Matriaux et Modlisation des Systmes LP2MS | Saber M.,Max Planck Institute For Physik Complexer Systeme
Chinese Journal of Physics | Year: 2011

The critical behavior and the magnetic properties of the spin 3/2 Blume-Emery-Griffiths model have been investigated on a square lattice within the framework of an effective field theory based on the use of a probability distribution technique. The effect of the transverse crystal field Dx on the magnetic properties is examined. The model presents very rich critical behavior, which includes first and second order phase transitions. The tricritical, isolated critical, and critical end points are also observed. © 2011 The Physical Society of the Republic of China. Source


El Hamri M.,Moulay Ismai University | Bouhou S.,Moulay Ismai University | Essaoudi I.,Moulay Ismai University | Ainane A.,Moulay Ismai University | And 3 more authors.
Superlattices and Microstructures | Year: 2015

The effective-field theory (EFT) with correlations based on the probability distribution technique has been used to study the magnetic properties of an antiferromagnetic cubic nanoparticle (nanocube). We have found that the surface shell parameters have strong effects on the compensation temperature, the magnetization profiles, coercivity, the shape and the number of the hysteresis loops for certain parameters. The effect of reduced temperature has also been examined on the hysteresis loops. © 2015 Elsevier Ltd. All rights reserved. Source


El Hamri M.,Moulay Ismai University | Bouhou S.,Moulay Ismai University | Essaoudi I.,Moulay Ismai University | Essaoudi I.,Uppsala University | And 4 more authors.
Physica A: Statistical Mechanics and its Applications | Year: 2016

The effective-field theory with correlations based on the probability distribution technique is used to investigate the magnetic properties of a diluted Ising nanocube consisting of a ferromagnetic spin-1/2 core which is interacting antiferromagnetically with a ferromagnetic spin-1/2 surface shell. The effect of the concentration of magnetic atoms is examined. A number of interesting phenomena have been found such as the existence of the compensation temperature and triple hysteresis loops. © 2015 Elsevier B.V. Source


Benhouria Y.,Unite Associee Au CNRST URAC 08 | Essaoudi I.,Unite Associee Au CNRST URAC 08 | Essaoudi I.,Uppsala University | Ainane A.,Unite Associee Au CNRST URAC 08 | And 4 more authors.
Superlattices and Microstructures | Year: 2014

The hysteresis loops and the thermodynamic properties of a ferroelectric or ferrielectric double walled nanotubes (A and B) are studied within the Ising model with mixed spins (SA=32 and SB=12) in the presence of the crystal and the external longitudinal electric fields. We use the Monte Carlo method to investigate the effects of the external electric field, the crystal field and the exchange interactions on the total polarization, susceptibility, specific heat and the internal energy of a double walled nanotubes (DWNTs). © 2014 Elsevier Ltd. All rights reserved. Source

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