Mémoires de Fin d’Etudes
Etablissement
Université de Sétif 1 - Ferhat Abbas
Affiliation
Département de Physique
Auteur
BOUKELKOUL, Mebarek
Directeur de thèse
A.Haroun (Professeur)
Co-directeur
A.Chergui (Professeur)
Filière
Physique de Solide
Diplôme
Doctorat
Titre
Propriétés magnéto-optiques des couches ultraminces et des slabs à base de métaux de transition
Mots clés
méthode SPR-LMTO-ASA - tétragonale -structure électronique. Les films de Nickel
Résumé
Abstract By means of the first principle calculation, we have investigated the structural, magnetic and magneto-optical properties of the ultrathin films of Ni and Fe growth by pseudomorphic epitaxy on semi-infinite crystals of Ir(001) and Au(001) respectively given by the formula Nin/Ir(001) and Fen/Ag(001) with (n=1, 2, 3…). We have adopted a relativistic approach using DFT theorem with local spin density approximation (LSDA). To calculate the electronic structure, we have used the Spin-Polarized Relativistic (SPR) Linear Muffin-Tin Orbitals (LMTO) with the Atomic Sphere Approximation (ASA) method. The crystalline structure was calculated by a relaxation process of the studied systems. A body centered tetragonal (bct) pseudomorphic crystalline structure with a tetragonality ratio c/a larger than unity was found. The magnetic calculations revealed that the inter-plane coupling is ferromagnetic with an enhanced magnetic moment. Using the Kubo-Greenwood linear response; the dispersion of the optical conductivity tensor as a function of the frequency of the incoming electromagnetic radiation is calculated from the energy band structure and the polar magneto-optical Kerr effect spectra are given over a photon energy range extended to 15eV. The microscopic origin of the most interesting features of Kerr rotations are interpreted by interband transitions.
Date de soutenance
2013
Cote
TH985
Pagination
90P
Format
CD
Statut
Soutenue