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Ben Ali M.,Institute of Nanomaterials and Nanotechnologies | Ben Ali M.,Mohammed V University | Mounkachi O.,Institute of Nanomaterials and Nanotechnologies | El Maalam K.,Institute of Nanomaterials and Nanotechnologies | And 10 more authors.
Superlattices and Microstructures | Year: 2015

One-dimensional Co-Nd ferrite nanostructures were prepared by controlled co-precipitation method. Co-Nd ferrite nanorods exhibits different magnetic phases: blocking phase with the corresponding blocking temperature (TB) of about 350 K, metamagnetic phase with the corresponding Morin transition temperature (TM) of about 550 K and canted ferrimagntic phase with the corresponding Neel temperature (TN) of about 800 K. These novel magnetic one-dimensional structures can potentially be used in nanoelectronic devices, magnetic sensors, and flexible magnets. © 2015 Published by Elsevier Ltd.


Masrour R.,Cady Ayyed University | Masrour R.,Mohammed V University | Benyoussef A.,Mohammed V University | Benyoussef A.,Institute for Nanomaterials and Nanotechnologies | Hamedoun M.,Institute for Nanomaterials and Nanotechnologies
Multidiscipline Modeling in Materials and Structures | Year: 2012

Purpose - This paper aims to combine the results of magnetic measurements with high temperature series expansions to determine the magnetic phase diagram of SrMn 1-xFe xO 3 0≤x≤1 perovskites materials. Design/methodology/approach - The authors have found antiferromagnetic ordering for lightly and heavily Fe-substituted material, while intermediate substitution leads to spin-glass behavior. Near the SrMn 0.5Fe 0.5O 3 composition these two types of ordering are found to coexist and affect one another. Findings - The spin glass behavior may be caused by competing ferromagnetic and antiferromagnetic interactions among Mn 4+ and observed Fe 3+ and Fe 5+ ions. Originality/value - The magnetic perovskites materials are several application in industrial applications (spintronics, magnetic random-access memory (MRAM), ...). © Emerald Group Publishing Limited.


Masrour R.,Cady Ayyed University | Masrour R.,Mohammed V University | Hamedoun M.,Institute for Nanomaterials and Nanotechnologies | Benyoussef A.,Mohammed V University | Benyoussef A.,Institute for Nanomaterials and Nanotechnologies
Chemical Physics Letters | Year: 2011

The magnetic properties of mixed spinels (Znx2+Fe1-x3+)A(Mn1- x2+Fe1+x3+)BO42- ferrite are studied. The effect of Zn doping on magnetic properties of MnFe2O4 ferrite spinel has been studied. The exchange interactions (JAA, JAB and J BB) and exchange constants (λAA, λAB and λBB) of this material are obtained. The general expression of saturation magnetization, the critical temperature and Curie constant (C) are obtained by the mean field theory. The high temperature series expansion combined with the Padé approximant is given to determinate the critical temperature of the mixed spinels. The critical exponent associated with the magnetic susceptibility is given for different values of Padé. © 2011 Elsevier B.V. All rights reserved.


Moussaoui H.E.,Mohammed V University | Moussaoui H.E.,Institute of Nanomaterials and Nanotechnologies | Masrour R.,Cady Ayyed University | Mounkachi O.,Institute of Nanomaterials and Nanotechnologies | And 4 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2012

The effect of Zn doping on magnetic properties of Fe3O 4 and CuFe2O4 ferrite spinels has been studied. The general expression of saturation magnetization, the critical temperature and Curie constant (C) are obtained by the mean field theory (MFT). By considering the high-temperature series expansions (HTSE) theory and the mean field approximation for the Néel's two-sublattice noncollinear model, we obtained the magnetic phase diagrams of ZnxFe1-xFe 2O4, and ZnxCu1-xFe 2O4. The Bohr magnetron is obtained for two systems. The central critical exponent γ associated with magnetic susceptibility for two systems is obtained. © Springer Science+Business Media, LLC 2012.


Mounkachi O.,Institute of Nanomaterials and Nanotechnology | El Moussaoui H.,Institute of Nanomaterials and Nanotechnology | Masrour R.,Mohammed V University | Masrour R.,Cady Ayyed University | And 7 more authors.
Materials Letters | Year: 2014

Sn0.95-yMn0.025Co0.025FeyO 2 (y=0.0, y=0.01) compounds have been synthesized by the precipitation exchange method. X-ray diffraction revealed that single-phase rutile polycrystalline structure was obtained. Magnetic measurements revealed that this sample exhibits spin glass behaviors for y=0 with a spin-freezing temperature around 150 K, while it exhibits ferromagnetism for y=0.01 below Tc=300 K. The existences of frustrated moments due to Ruderman-Kittle-Kasuya-Yosida interactions in Sn(Mn, Co)O2 may be responsible for the spin glass state formed in Sn(Mn,Co)O2. With a tri-doping by Fe this magnetic frustration is broken, indicating that the Fe atoms introduces charge carriers responsible for the change of interaction from frustrated behaviors to ferromagnetic interaction. © 2014 Elsevier B.V.

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