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Bouhou S.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | El Hamri M.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Essaoudi I.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Essaoudi I.,Uppsala University | And 4 more authors.
Physica B: Condensed Matter | Year: 2014

Using the effective field theory with a probability distribution technique that accounts for the self-spin correlation function, the thermal and the magnetic properties of a single Ising nanoparticle consisting of a ferromagnetic core, a ferromagnetic surface shell and a ferrimagnetic interface coupling are examined. The effect of the transverse field in the surface shell, the exchange interactions between core/shell and in surface shell on the free energy, thermal magnetization, specific heat and susceptibility are studied. A number of interesting phenomena have been found such as the existence of the compensation phenomenon and the magnetization profiles exhibit P-type, N-type and Q-type behaviors. © 2014 Elsevier B.V. Source


Benhouria Y.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Essaoudi I.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Ainane A.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Ainane A.,Max Planck Institute For Physik Complexer Systeme | And 3 more authors.
Superlattices and Microstructures | Year: 2014

The Monte Carlo simulation technique has been used to study the effect of a negative core/shell coupling on the dielectric properties and the hysteresis behavior of the spin-1 Ising nanowire system with a square surface area. The influence of the temperature and the exchange coupling on the critical and compensation behaviors of the ferroelectric and ferrielectric nanowire are also investigated. © 2014 Elsevier Ltd. All rights reserved. Source


Saber M.,Moulay Ismai University | Saber M.,Max Planck Institute For Physik Complexer Systeme | Ainane A.,Moulay Ismai University | Ainane A.,Max Planck Institute For Physik Complexer Systeme | And 3 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2010

Within the framework of the transverse spin - frac(1, 2) Ising model and by using the effective field theory with a probability distribution technique that accounts for the self spin correlations, we have studied the critical properties of an L-layer film of simple cubic symmetry in which the exchanges strength are assumed to be different from the bulk values in NS surface layers. We derive and illustrate the expressions for the phase diagrams, order parameter profiles and susceptibility. In such films, the critical temperature can shift to either lower or higher temperature compared with the corresponding bulk value. We calculate also some magnetic properties of the film, such as the layer magnetizations, their averages and their profiles and the longitudinal susceptibility of the film. The film longitudinal susceptibility still diverges at the film critical temperature as does the bulk longitudinal susceptibility. © 2009 Elsevier B.V. All rights reserved. Source


Bouhou S.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Essaoudi I.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Ainane A.,Laboratoire Of Physique Des Materiaux Et Modelisation Des Systemes | Ainane A.,Max Planck Institute For Physik Complexer Systeme | And 5 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2012

In this work, the magnetization, susceptibility, and hysteresis loops of a magnetic nanowire are described by the transverse Ising model using the effective field theory within a probability distribution technique. The effects of the exchange interaction between core/shell and the external fields on the magnetization and the susceptibility of the system are examined. Some characteristic phenomena are found in the thermal variations, depending on the ratios of the physical parameters in the shell and the core. © 2012 Elsevier B.V. All rights reserved. Source

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