Browsing by Author "Guittoum, Abderrahim"

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    Effect of Fe content on the structural and magnetic properties of ternary (Ni 60 Co 40 ) 100-x Fe x nanomaterials synthesized by hydrothermal route
    (World Scientific, 2024) Gaci, Yacine; Guittoum, Abderrahim; Hemmous, Messaoud; Martínez-Blanco, David; Gorria, Pedro; Blanco, Jesús A.; Aouaroun, Tahar
    The effect of iron content on the structure, morphology and magnetic properties of (Ni60Co40)100-xFex powders synthesized by hydrothermal method has been studied. Several samples have been elaborated for different Fe content (x = 0, 3, 5, 7, 10 and 13.5). The as- prepared samples have been characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometry (VSM). From XRD spectra and for all Fe content, we have shown the presence of both face centered cubic (FCC) and Hexagonal (HCP) nanosized phases. The lattice parameter increases with increasing Fe content and the grains size varies with Fe content to reach a minimum value of 32 nm for (Co40Ni60)90Fe10. From hysteresis curves, we have extracted the saturation magnetization, Ms, and the coercivity, Hc. We noticed that Ms increases and then decreases as a function of Fe content. The values of Hc vary from 156 Oe to 186 Oe depending on the particles shape.
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    Effect of Si addition on the structural, microstructural and magnetic properties of (Fe 70 Al 30 ) 100-x Si x nanostructured powders elaborated by mechanical alloying
    (Elsevier, 2017) Hemmous, Messaoud; Guittoum, Abderrahim; Kezrane, M.; Boukherroub, N.; Martínez-Blanco, David; Gorria, Pedro; Blanco, Jesus A.; Souami, N.; Fennineche, N.
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    Impact of substrate on the formation mechanism of electrodeposited Co–Ni thin films: a comprehensive study of structural, morphological, and magnetic properties
    (Springer, 2024) Boulegane, Ala; Guittoum, Abderrahim; Hadj Larbi, Abderrahim; Laggoun, Ali; Boudissa, Mokhtar
    In this work, we investigated the effect of substrate on the structural, morphological, and magnetic properties of electrodeposited CoNi thin films from a chloride bath. Three samples of CoNi films were deposited at room temperature onto different substrates: FTO, ITO, and Cu. Electrochemical studies were performed using cyclic voltammetry experiments. Energy-dispersive X-ray spectroscopy (EDX) showed that all the samples had a cobalt content of more than 80%. X-ray diffraction (XRD) spectra revealed that the films deposited on Cu had a face-centered cubic (FCC) phase, while those deposited on ITO and FTO had a mixture of hexagonal close-packed (HCP) and FCC phases. The lattice parameter (a) and crystallite size (D) were strongly dependent on the substrate. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to observe the morphology of the films. All the samples had a granular morphology with spherical grains, but the roughness and surface distribution varied with the substrate. The magnetic properties of the films, such as coercivity (Hc) and squareness (S), were investigated using a vibrating sample magnetometer (VSM). The results showed that Hc and S were both affected by the substrate and the film composition. Overall, our results showed that the substrate had a significant effect on the structural, morphological, and magnetic properties of electrodeposited CoNi thin films. These findings could be used to design and optimize CoNi thin films for specific applications.
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    Magnetic properties of bcc and bcc-fcc Fe-Pd alloys produce by thermal evaporation technique
    (Elsevier, 2014) Bahamida, Saida; Laggoun, Ali; Guittoum, Abderrahim; Fnidiki, Abeslem; Boudissa, Mokhtar
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    Mössbauer Spectroscopy Analysis of FeCo Nano-Particles Alloy Synthesized by Hydrothermal Method
    (Trans Tech Publications, 2025) Halimi, Mohamed Walid; Guittoum, Abderrahim; Hemmous, Messaoud; Bouelkreb, Imane
    Mössbauer spectroscopy (MS), was used to characterize the synthesized materials prepared from the elemental powders by hydrothermal method which are binary iron-based nanoparticles (NPs) Fe15Co85 and Fe10Co90 alloys. The transmission 57Fe Mössbauer spectra were measured at room temperature RT (T~300K), using 57Co γ-ray source with an Activity ~ 1.85 GBq (50 mCi). The analysis of Mössbauer spectra curves was by using WinNormos with two subspectra with the “Site” option and then with the “Dist” option in order to learn more about hyperfine interactions and parameters such as isomer shifts IS, quadruple splitting QS and hyperfine magnetic field Bhf. MS results observe only one Zeeman sextet with a relative area of ~77.125% with parameter Bhf = 32.727 T and line width Γ=0.693 mm/s for Fe10Co90, and a relative area of ~84.719% with parameter Bhf = 34.354 T and line width Γ=1.043 mm/s for Fe15Co85 and one broad singlet which confirms the body-centered cubic structure BCC. The main contribution to the spectra comes from the magnetic sextet which is assigned to ferromagnetic FeCo phase which is the dominant one while the singlet is assigned to paramagnetic phase. As a result of the analysis of the distributions hyperfine magnetic field the average values of the hyperfine parameters of the Mössbauer spectra were obtained Fe10Co90 = 28.3363 T and Fe15Co85 = 31.4657 T. Therefore, it is observed that the increasing of the cobalt concentration decreases the hyperfine field. The results observe indicates Co concentration dependence, where for Co-rich alloys (Fe10Co90) the FCC (face-centered cubic structure) contributing to the decrease in Bhf due to the absence of BCC. the obtained NPs most likely to be in disordered structure A2
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    Structural and mössbauer studies of evaporated Fe100-xPdx thin films
    (EDP Sciences, 2014) Laggoun, Ali; Guittoum, Abderrahim; Bahamida, Saida; Boudissa, Mokhtar; Fnidiki, Abdesslem
    In order to study the influence of palladium atom on structural and hyperfine properties, Fe100-xPdx films (x = 15, 20 and 36 at.%) were deposited by evaporation method onto a Si (1 0 0) substrate. They were then characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and conversion electron Mössbauer spectroscopy (CEMS). X-ray diffraction analysis shows the presence of supersaturated solid solution with bcc structure for Pd concentration of 15% and 20%. However, for 36% of Pd, in addition to the supersaturated α-FePd (bcc) phase, another disordered FePd3 phase with fcc structure is present. The grain size did not change with Pd concentration and was about 11 nm, and the lattice parameter increased from 0.287 Å to 0.290 Å with an increasing Pd concentration. The adjustment of Mössbauer spectra confirms the results obtained by X-ray diffraction. Moreover, the Mössbauer spectra have shown that a magnetic texture is present for samples with 20 and 36%. For these Pd concentrations, we believe that a development of an out-of plane magnetic anisotropy occurs in our films
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    Structural, morphological, and magnetic properties of electrodeposited coNi thin films on the FTO substrate
    (Springer, 2022) Boulegane, Ala; Guittoum, Abderrahim; Laggoun, Ali; Boudissa, Mokhtar; Hemmous, Messaoud
    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 microscopy (SEM), and atomic force microscopy (AFM). The chemical compositions are obtained using energy dispersive X-ray (EDX) and the magnetic properties were studied using a vibrating sample magnetometer (VSM). From X-ray diffraction, we have shown the presence of the FCC phase of CoNi binary alloy with a well-pronounced texture along the < 111 > , < 200 > , and < 220 > planes for all samples. We have found that the applied potential has an influence on crystallite sizes. Besides, a moderate change in the lattice parameter has been observed with increasing applied potential. The AFM images show that the applied potential changes the morphology and the surface roughness of CoNi films. In addition, the SEM images confirm the granular morphology of CoNi deposits and show a good relationship between voltage and grain size. The EDX spectrums confirm the deposition of the cobalt and the nickel on the FTO substrate and show the precedence deposition of Co compared with Ni. The extracted coercive field Hc and squareness from the hysteresis loops explained the good correlation between the magnetic and structural properties of CoNi thin films