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Sökning: WFRF:(Charkaoui A.)

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1.
  • Charkaoui, A., et al. (författare)
  • Critical behavior and magnetocaloric effect in C -implanted Fe93Zr7 amorphous films
  • 2020
  • Ingår i: Solid State Communications. - : Elsevier BV. - 0038-1098 .- 1879-2766. ; , s. 316-317
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the effect of carbon ion-implantation on the critical behavior of Fe93Zr7 amorphous films. Both the as-grown and carbon-implanted Fe93Zr7 samples exhibit a second order ferromagnetic to paramagnetic transition. The critical exponents were investigated through different techniques such as modified-Arrott plot, the critical isotherm analysis and the Windom scaling relation. Analysis of the critical behavior was presented in terms of the magnetocaloric effect around TC. While there is a significant increase of the magnetization and TC upon C-implantation, the critical exponents were only slightly affected by implantation and were in line with those of the 3D-Heisenberg model.
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2.
  • Alouhmy, M., et al. (författare)
  • Effects of carbon implantation on the low temperature magnetism behavior in amorphous Fe93Zr7 films
  • 2022
  • Ingår i: Materials Science & Engineering. - : Elsevier. - 0921-5107 .- 1873-4944. ; 279
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a detailed investigation on the effects of C-implantation on low temperature magnetic behavior in Fe93Zr7 amorphous films using spin wave theory, law of approach to saturation, and Alben and Becker's theory. Significant increase in Curie temperature with a decrease in coercivity were observed upon C-implantation. Bloch's law was used to analyze the temperature dependence of magnetization, and several important param-eters were extracted such as the stiffness constant of the spin wave, and the exchange constant. The local random anisotropy constant decreases from 0.35 to 0.19 MJ/m(3) with increasing carbon concentration from 0 to 11%. The ferromagnetic correlation length for which the anisotropy directions are assumed to be arbitrarily oriented in-creases significantly with increasing carbon content. By the use of the theory of Alben and Becker, we also extracted the local anisotropy from coercivity, and reasonable agreement was found with random magnetic anisotropy approach.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Moubah, Reda (2)
Charkaoui, A. (2)
Lassri, H. (2)
Alouhmy, M. (1)
Sajieddine, M. (1)
Abid, M. (1)
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Bouhbou, M. (1)
Elouafi, A. (1)
Jönsson, Petra (1)
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Uppsala universitet (2)
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