Effet de la relaxation sur les propriétés magnéto-optiques des films Ultraminces de Nin/Rh (001) / Yasmina Bedjaoui  

Public ISBD Titre : Effet de la relaxation sur les propriétés magnéto-optiques des films Ultraminces de Nin/Rh (001) Type de document : texte imprimé Auteurs : Yasmina Bedjaoui, Auteur ; Samira Makhloufi, Auteur ; Mebarek Boukelkoul, Directeur de thèse Année de publication : 2022 Importance : 1 vol (67 f .) Format : 29cm Langues : Français (fre) Catégories : Thèses & Mémoires:Chimie Mots-clés : Chimie Index. décimale : 540 Chimie et sciences connexes Résumé : In this work, we have investigated the structural and magneto-optical properties of the ultrathin films of Ni grown by pseudo-morphic epitaxy on semi-infinite crystal of ????â„Ž(001) and given by the formula ????????????/????â„Ž(001) with (???? = 1,2,3 … . ) which are used in technological applications, in particular in the field of Storage and magnetic recording. We have adopted a relativistic approach using DFT theorem with local spin density approximation (LSDA). The Spin-Polarized Relativistic (SPR) Linear Muffin-Tin Orbitals (LMTO) with the Atomic Sphere Approximation (ASA) method are used to calculate the structural properties which are determined from the contraction by a process of optimization of the total energy as a function of the distance between the different atomic planes that constitute these films. The pseudo - morphic crystalline structure found is body centered tetragonal (bct) with tetragonality ratio ????/???? larger than unity contracted structure).The magneto-optical properties are studied from the polar magnéto-optique Kerr effect spectra in the visible range. It spectrum was characterized by a negative peak in the range of the visible near???? = 6.3????????. The microscopicorigin of the mostinterestingfeatures of Kerr rotations are interpreted by interband transitions and the symmetries involved in this transitions are, in their majority, of the nonspin- flip type Côte titre : MACH/0282 En ligne : https://drive.google.com/file/d/1UYMC8t3zIPq0JVwEFFMETrGptDNNsyF7/view?usp=share [...] Format de la ressource électronique : pdf Effet de la relaxation sur les propriétés magnéto-optiques des films Ultraminces de Nin/Rh (001) [texte imprimé] / Yasmina Bedjaoui, Auteur ; Samira Makhloufi, Auteur ; Mebarek Boukelkoul, Directeur de thèse . - 2022 . - 1 vol (67 f .) ; 29cm. Langues : Français (fre) Catégories : Thèses & Mémoires:Chimie Mots-clés : Chimie Index. décimale : 540 Chimie et sciences connexes Résumé : In this work, we have investigated the structural and magneto-optical properties of the ultrathin films of Ni grown by pseudo-morphic epitaxy on semi-infinite crystal of ????â„Ž(001) and given by the formula ????????????/????â„Ž(001) with (???? = 1,2,3 … . ) which are used in technological applications, in particular in the field of Storage and magnetic recording. We have adopted a relativistic approach using DFT theorem with local spin density approximation (LSDA). The Spin-Polarized Relativistic (SPR) Linear Muffin-Tin Orbitals (LMTO) with the Atomic Sphere Approximation (ASA) method are used to calculate the structural properties which are determined from the contraction by a process of optimization of the total energy as a function of the distance between the different atomic planes that constitute these films. The pseudo - morphic crystalline structure found is body centered tetragonal (bct) with tetragonality ratio ????/???? larger than unity contracted structure).The magneto-optical properties are studied from the polar magnéto-optique Kerr effect spectra in the visible range. It spectrum was characterized by a negative peak in the range of the visible near???? = 6.3????????. The microscopicorigin of the mostinterestingfeatures of Kerr rotations are interpreted by interband transitions and the symmetries involved in this transitions are, in their majority, of the nonspin- flip type Côte titre : MACH/0282 En ligne : https://drive.google.com/file/d/1UYMC8t3zIPq0JVwEFFMETrGptDNNsyF7/view?usp=share [...] Format de la ressource électronique : pdf

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