Hemmous Messaoud

Nuclear Research Centre of Algiers, 02 Bd Frantz Fanon, BP 399, Alger-Gare, Algiers, Algeria · Laser

In this present work we examine the effect of the Ni thickness t (t ranges from 4 to 67 nm) and of the Cu underlayer (with tCu = 27, 52 and 90 nm) on the structural and magnetic properties of Ni/Cu bilayers deposited onto CuZn substrate. The Ni films and the Cu underlayer have been deposited by thermal evaporation. The structural properties were de...

Nanocrystalline Fe90Ni10 alloys were synthesized by mechanical alloying, starting from a powder mixture of elemental Fe and Ni. The phase evolution and magnetic properties were investigated, as a function of milling time, using the X-ray diffraction (XRD), the vibrating sample magnetometer (VSM), and the 57Fe Mössbauer spectroscopy. From XRD result...

We report on how the microstructure and the silicon content of nanocrystalline ternary (Fe0.8Al0.2)100–xSix powders (x=0, 5, 10, 15 and 20 at%) elaborated by high energy ball milling affect the magnetic properties of these alloys. The formation of a single-phase alloy with body centred cubic (bcc) crystal structure is completed after 72 h of millin...

We report on the crystal structure, microstructure and magnetic properties of Ni nanoparticles (NPs), with an average diameter of around 40 nm, produced by hydrothermal method. A series of Ni powders was synthesized at relatively low temperature (140 °C) by varying the NaOH concentration. The crystal structure, microstructure and magnetic propertie...

The effect of iron content on the structure, morphology and magnetic properties of (Ni[Formula: see text]Co[Formula: see text])[Formula: see text]Fe[Formula: see text] powders synthesized by hydrothermal method has been studied. Several samples have been elaborated for different Fe content ([Formula: see text] = 0, 3, 5, 7, 10 and 13.5). The as- pr...

The monitoring of the alpha irradiation effect on the microstructural deformation of CR39 via the variation of free volumes has been studied. CR39 samples have been irradiated with alpha particles at fluencies Ф of 2.6 · 108, 5.27 · 108, 7.91 · 108, 1.3 ·109, 1.84 · 109, and 3.6 · 109 α/cm2. The samples have been investigated with positron annihila...

This study aimed at characterizing some properties of an Fe-Al alloy obtained from a congruent melt within 53–57 wt.% composition range. It focused on checking the homogeneity and uniqueness of the constituent's phase. Different analyses and examination techniques were used to explore and assess these properties. The obtained results were compared...

Fe(Ni, Si) solid solutions were elaborated by high energy mechanical alloying from elemental Fe, Ni and Si powdersfor a milling time of 72 h. From X-ray diffraction (XRD) analysis, it has been shown that the Fe(Ni, Si) samples present a single phase in the whole range of Si content and exhibit a solid solution of disordered bcc α-Fe. The lattice pa...

CoNi films were elaborated by electrodeposition onto FTO substrates using a chloride bath with a metallic ion molar ratio [Co2+]/[Ni2+] equals 1/1. Three samples were elaborated for different potentials ranging from −1.6 to −1.5 V. The structure and the morphology of CoNi films were studied using X-ray diffraction (XRD), scanning electron microscop...

This study aims at characterizing of η Fe2Al5 intermetallic compound obtained by congruent melt from liquid. It represents a methodical and rational approach to the challenges encountered namely for the stoichiometry and the homogeneity of the η-Fe2Al5 phase obtained from a congruent melt. The relationship between the microstructure and the mechani...

We have investigated the crystal structure, the microstructural and morphological characteristics, as well as the magnetic properties of Co nanoparticles (NPs) synthesized by a hydrothermal method. A series of samples has been elaborated for different concentrations of sodium hydroxide. The analysis of X-ray diffraction patterns, using two differen...

Ni thin films have been electrodeposited on [Formula: see text]-Si (100) substrates for different deposition times at a fixed potential of 2[Formula: see text]V. The as-elaborated films have been characterized by Rutherford backscattering spectroscopy (RBS), X-ray diffraction (XRD), atomic force microscopy (AFM) and vibrating sample magnetometry (V...

We have investigated the effect of the Nickel concentration on the crystal structure and microstructure, as well as on the hyperfine and magnetic properties of nanostructured (Fe0.7Al0.3)100-xNix powders (x = 0, 5, 10 and 15 at.%) fabricated by mechanical alloying. After 72 h of milling, all the Fe(Al, Ni) samples are single-phase disordered solid...

We report on the synthesis of Co30Ni70 nanoparticles using hydrothermal method at low temperatures and short times (100 °C, 2 h) without any surfactant or external magnetic field. The effect of NaOH concentration on the crystal structure, microstructure, and magnetic properties of CoNi samples has been investigated by x-ray diffraction (XRD), scann...

Nanostructured (Fe 0.6 Al 0.4 ) 100-x Si x powders with x= 0, 5, 10, 15 and 20 at.% were elaborated by means of mechanical alloying for a fixed milling time of 72 h. We have investigated the effect of silicon addition on the microstructure and magnetic properties of these ternary alloys. X-ray diffraction experiments reveal that these powders are s...

The Magneto-Optic Kerr Effect (MOKE) technique has been used to investigate the magnetic properties of Ni thin films, with thickness t ranging from 9 to 163 nm, evaporated onto several substrates (glass, Si (111), mica and Cu) with and without an evaporated Cu underlayer. The MOKE observations were correlated with the surface morphology inferred fr...

We have successfully synthesised Ni75Fe25 nanostructured powders by means of low temperature (150 °C) hydrothermal method using sodium hydroxide (NaOH) as co-reduction agent. The powders are in fact large agglomerations of small nanoparticles with average diameters below 30 nm. The concentration of NaOH seems to play an important role in the final...

Pure NiCo nanoparticles with different compositions were synthesized by hydrothermal route at 100∘C during 2 h. From x-ray diffraction analysis, we have shown that the structure varies from face-centered cubic (FCC) phase to a mixture of FCC and hexagonal close-packed (HCP) phases depending on the composition. For all CoxNi100−x powders, the micros...

We have studied the effect of thickness on the structural, microstructural, electrical and magnetic properties of Ni films electrodeposited onto n-Si (100) substrates. A series of Ni films have been prepared for different potentials ranging from -1.6V to -2.6V. Rutherford backscattering spectrometry (RBS), X-ray diffraction (XRD), four point probe...

In the present work, nanocrystalline (Fe70Al30)100-xSix (x=0, 5, 10, 15 and 20 at.%) powders were prepared by mechanical alloying for a fixed milling time of 72 h. The powder samples were characterized in terms of structural evolution, morphological changes and magnetic behavior. The X-ray diffraction measurements reveal that all the samples are of...

We have studied the effect of the silicon concentration on the structural and hyperfine properties of nanostructured Fe100−xSix powders (x=10, 20, 25 and 30at.%) prepared by mechanical alloying. The X-ray diffraction (XRD) studies indicated that after 72h of milling, the solid solution bcc-α-Fe(Si) is formed. The grain sizes, 〈D〉 (nm), decreases wi...

Single-phase (Fe0.7Co0.3)100-�xSix nanostructure powders (x = 0, 5, 10, 15 and 20) have been elaborated by mechanical alloying in order to investigate the effect of silicon on the microstructure and magnetic properties of these alloys. A disordered Fe(Co,Si) solid solution with body centered cubic (bcc) crystal structure is formed after 72 h of m...

We study the effect of thickness on the structural and magnetic properties of permalloy thin films, evaporated on glass substrate. The films thicknesses range from 16 to 90 nm. From X-ray diffraction spectra analysis, we show that the thinner films present a 1,1,1 Preferred orientation. However, the thicker films exhibit a random orientation. The g...

We report the effect of deposition potential on the morphology, structure and magnetic properties of Ni80Fe20 (Permalloy: Py) deposits, elaborated by electrochemical process onto silicon nanowires (SiNWs). The morphology of SiNWs and Py/SiNWs were performed with scanning electron microscopy (SEM). The SEM micrographs reveal the formation of SiNWs a...

Ni thin films have been deposited by thermal evaporation onto glass, Si, Cu, mica, and Al2O3 substrates with and without a Cu underlayer. The Ni thicknesses, t, are in the 4 to 163 nm range. The Cu underlayer has also been evaporated with a Cu thickness equal to 27, 52, and 90 nm. The effects of substrate, Ni thickness, and the Cu underlayer on the...

Powder samples containing high purity nickel nanoparticles (NPs) were prepared by hydrothermal method from Ni(II) chloride hexahydrate (NiCl2·6H2O) under the presence of sodium hydroxide (NaOH) with different concentrations between 5 and 25 mol/L. The synthesis of the NPs occurs through chemical reduction at relatively low temperature (140 °C). The...

The aim of the present work is to elaborate nanocrystalline soft Fe80Ni20 powders and to study the relationship between their magnetic behaviour and structural changes after different milling times. A series of Fe80Ni20 powders were elaborated by the mechanical alloying process for milling time ranging from 3 to 25 h. X-ray diffraction results show...

We have studied the effect of substrates [glass and Si(100)], of Ni thickness (t"N"i) and of the deposition rate [v"1=13nm/min and v"2=22nm/min] on the structural and electrical properties of evaporated Ni thin films. The Ni thickness, measured by the Rutherford backscattering (RBS) technique, ranges from 28 to 200nm. From X-ray diffraction, it was...