Max Planck Institute For Physik Complexer Systeme

Dresden, Germany

Max Planck Institute For Physik Complexer Systeme

Dresden, Germany
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Oubelkacem A.,Moulay Ismaï University | Essaoudi I.,Moulay Ismaï University | Ainane A.,Moulay Ismaï 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.


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.


Torrontegui E.,University of the Basque Country | Torrontegui E.,Max Planck Institute For Physik Complexer Systeme | Munoz J.,University of the Basque Country | Ban Y.,University of the Basque Country | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011

Diffraction in time (DIT) is a fundamental phenomenon in quantum dynamics due to time-dependent obstacles and slits. It is formally analogous to diffraction of light, and is expected to play an increasing role in the design of coherent matter wave sources, as in the atom laser, to analyze time-of-flight information and emission from ultrafast pulsed excitations, and in applications of coherent matter waves in integrated atom-optical circuits. We demonstrate that DIT emerges robustly in quantum waves emitted by an exponentially decaying source and provide a simple explanation of the phenomenon, as an interference of two characteristic velocities. This allows for its controllability and optimization. © 2011 American Physical Society.


Bouhou S.,Moulay Ismaï University | Essaoudi I.,Moulay Ismaï University | Ainane A.,Moulay Ismaï University | Ainane A.,Max Planck Institute For Physik Complexer Systeme | And 4 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

In this paper, the phase diagrams of diluted Ising nanowire consisting of core and surface shell coupling by Jcs exchange interaction are studied using the effective field theory with a probability distribution technique, in the presence of transverse fields in the core and in the surface shell. We find a number of characteristic phenomena. In particular, the effect of concentration c of magnetic atoms, the exchange interaction core/shell, the exchange in surface and the transverse fields in core and in surface shell of phase diagrams are investigated. © 2013 Elsevier B.V.


Bouhou S.,Moulay Ismaï University | Essaoudi I.,Moulay Ismaï University | Ainane A.,Moulay Ismaï University | Ainane A.,Max Planck Institute For Physik Complexer Systeme | And 5 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2013

A magnetic diluted nanowire with cylindrical structure described by the Ising model is investigated. Using the effective field theory with a probability distribution technique, the influence of the dilution on the phase diagrams, susceptibility and the hysteresis loops are discussed in detail. Novel features are obtained for the thermal variations of longitudinal susceptibility and longitudinal magnetization. We have investigated the magnetic reversal of the system and have found the existence of triple hysteresis loops patterns, affected by the concentration of magnetic atoms, the temperature, and the exchange interaction between the core and the surface shell. © 2012 Springer Science+Business Media, LLC.


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.


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.


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.


El Hamri M.,Moulay Ismaï University | Bouhou S.,Moulay Ismaï University | Essaoudi I.,Moulay Ismaï University | Ainane A.,Moulay Ismaï 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.


El Hamri M.,Moulay Ismaï University | Bouhou S.,Moulay Ismaï University | Essaoudi I.,Moulay Ismaï 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.

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