{"id":24705,"date":"2024-06-26T12:17:32","date_gmt":"2024-06-26T10:17:32","guid":{"rendered":"https:\/\/www.ummto.dz\/fs\/?p=24705"},"modified":"2024-06-30T14:41:40","modified_gmt":"2024-06-30T12:41:40","slug":"avis-de-soutenance-de-these-de-doctorat-en-sciences-en-physique-specialiste-physique-des-materiaux-de-mme-challali-rebiha","status":"publish","type":"post","link":"https:\/\/www.ummto.dz\/fs\/avis-de-soutenance-de-these-de-doctorat-en-sciences-en-physique-specialiste-physique-des-materiaux-de-mme-challali-rebiha\/","title":{"rendered":"AVIS DE SOUTENANCE DE TH\u00c8SE DE DOCTORAT EN SCIENCES EN PHYSIQUE SP\u00c9CIALISTE : Physique des Mat\u00e9riaux DE Mme CHALLALI Rebiha"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.25.2&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb130%\u00a0\u00bb hover_enabled=\u00a0\u00bb0&Prime; border_color_all=\u00a0\u00bb#8300E9&Prime; border_style_all=\u00a0\u00bbdouble\u00a0\u00bb box_shadow_style=\u00a0\u00bbpreset5&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb border_width_all=\u00a0\u00bb1px\u00a0\u00bb sticky_enabled=\u00a0\u00bb0&Prime;][et_pb_row _builder_version=\u00a0\u00bb4.25.1&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb98%\u00a0\u00bb max_width=\u00a0\u00bb1196px\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.25.1&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_accordion _builder_version=\u00a0\u00bb4.25.2&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb hover_enabled=\u00a0\u00bb0&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0&Prime;][et_pb_accordion_item title=\u00a0\u00bbAVIS DE SOUTENANCE DE TH\u00c8SE DE DOCTORAT EN SCIENCES EN PHYSIQUE SP\u00c9CIALISTE : Physique des Mat\u00e9riaux\u00a0\u00bb open=\u00a0\u00bbon\u00a0\u00bb _builder_version=\u00a0\u00bb4.25.2&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb hover_enabled=\u00a0\u00bb0&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb width=\u00a0\u00bb93%\u00a0\u00bb max_width=\u00a0\u00bb91%\u00a0\u00bb min_height=\u00a0\u00bb975px\u00a0\u00bb sticky_enabled=\u00a0\u00bb0&Prime;]<\/p>\n<p><strong><span style=\"color: #ff0000\">Mme. CHALLALI Rebiha<\/span><\/strong><br \/>Soutiendra publiquement sa th\u00e8se de <strong><span style=\"color: #ff0000\">Doctorat en sciences en Physique des Mat\u00e9riaux<\/span><\/strong><br \/>Intitul\u00e9 : <strong><span style=\"color: #0000ff\">\u00ab Spectres magnoniques associ\u00e9s aux surfaces et aux interfaces entres structures cubiques ferromagn\u00e9tiques \u00bb<\/span><\/strong><br \/>Le : <strong><span style=\"color: #ff0000\">lundi 08 juillet 2024<\/span><\/strong> \u00e0<strong><span style=\"color: #ff0000\"> 10h00<\/span><\/strong>, \u00e0 la salle de conf\u00e9rences de la facult\u00e9 des sciences de l\u2019UMMTO (Campus Hasnaoua II, dit aussi Bastos).<\/p>\n<p>Directeur de Th\u00e8se : Pr. BOURAHLA Boualem<\/p>\n<p>Devant le jury d\u2019examen suivant :<\/p>\n<table width=\"667\" border=\"1\" style=\"height: 229px;width: 667px;float: left\">\n<tbody>\n<tr>\n<td style=\"width: 213.125px\"><strong>Mme. NAFA Ouahiba\u00a0 \u00a0\u00a0<\/strong><\/td>\n<td style=\"width: 157.703px\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 MCA<\/strong><\/td>\n<td style=\"width: 136.672px\"><strong>UMMTO<\/strong><\/td>\n<td style=\"width: 131.5px\"><strong>Pr\u00e9sidente<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 213.125px\"><strong>M. BOURAHLA Boualem<\/strong><\/td>\n<td style=\"width: 157.703px\"><strong>Professeur<\/strong><\/td>\n<td style=\"width: 136.672px\"><strong>UMMTO<\/strong><\/td>\n<td style=\"width: 131.5px\"><strong>Directeur de th\u00e8se <\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 213.125px\"><strong>M<\/strong><sup> <\/sup><strong>.TIGRINE Rachid<\/strong><\/td>\n<td style=\"width: 157.703px\"><strong>Professeur<\/strong><\/td>\n<td style=\"width: 136.672px\"><strong>UAD\u2044Adrar<\/strong><\/td>\n<td style=\"width: 131.5px\"><strong>Examinateur<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 213.125px\"><strong>M. BELAYADI Adel<\/strong><\/td>\n<td style=\"width: 157.703px\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 MCA<\/strong><\/td>\n<td style=\"width: 136.672px\"><strong>ESSAI-El-Harrach<\/strong><\/td>\n<td style=\"width: 131.5px\"><strong>Examinateur<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 213.125px\"><strong>Mme. BOUCHERRAB Malika<\/strong><\/td>\n<td style=\"width: 157.703px\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 MCA<\/strong><\/td>\n<td style=\"width: 136.672px\"><strong>UMMTO<\/strong><\/td>\n<td style=\"width: 131.5px\"><strong>Invit\u00e9e<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>La communaut\u00e9 universitaire est cordialement invit\u00e9e<\/p>\n<p><u><strong><span>T\u00e9l\u00e9charger : <a href=\"https:\/\/www.ummto.dz\/fs\/wp-content\/uploads\/2024\/06\/Avis-de-soutenance-de-Mme-CHALLALI-Rebiha-2.pdf\" rel=\"attachment wp-att-24713\">Avis de soutenance de Mme CHALLALI Rebiha<\/a><\/span><\/strong><\/u><\/p>\n<p>[\/et_pb_accordion_item][et_pb_accordion_item title=\u00a0\u00bbR\u00e9sum\u00e9 de la th\u00e8se en Fran\u00e7ais\u00a0\u00bb open_toggle_text_color=\u00a0\u00bb#E02B20&Prime; _builder_version=\u00a0\u00bb4.25.1&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_orientation=\u00a0\u00bbjustified\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb toggle_text_align=\u00a0\u00bbjustify\u00a0\u00bb open=\u00a0\u00bboff\u00a0\u00bb]<\/p>\n<p><strong><span style=\"color: #ff0000\">R\u00e9sum\u00e9<\/span><\/strong><\/p>\n<p>Les propri\u00e9t\u00e9s magn\u00e9tiques des mat\u00e9riaux sont fortement d\u00e9pendantes de la g\u00e9om\u00e9trie de la structure cristalline et des arrangements des sites. Au sein du m\u00eame mat\u00e9riau, les propri\u00e9t\u00e9s sont aussi sensibles \u00e0 la variation de la concentration et de l\u2019environnement atomique.<\/p>\n<p>A la surface et \u00e0 l\u2019interface, le changement de sym\u00e9trie et la r\u00e9duction de coordinence entrainent un grand changement dans les propri\u00e9t\u00e9s physiques des mat\u00e9riaux. Des \u00e9tats \u00e9nerg\u00e9tiques suppl\u00e9mentaires sont observ\u00e9s sur les spectres dynamiques des diff\u00e9rents assemblages de spins. Car, la modification du voisinage atomique est \u00e0 l\u2019origine des nouvelles propri\u00e9t\u00e9s \u00e9lectroniques, vibrationnelles et magn\u00e9tiques dans toutes les structures atomiques.<\/p>\n<p>Dans cette th\u00e8se, nous avons r\u00e9alis\u00e9 une \u00e9tude th\u00e9orique portant sur le comportement, les excitations des spins et leur mouvement de pr\u00e9cession dans les structures cubiques \u00e0 couplage ferromagn\u00e9tique. Particuli\u00e8rement, nous avons relev\u00e9 l\u2019impact de la brisure de sym\u00e9trie sur la pr\u00e9cession des spins dans les trois structures cubiques \u00e0 couplage ferromagn\u00e9tiques.<\/p>\n<p>Aujourd\u2019hui, il est \u00e9tabli que dans toutes les structures semi-infinies, les \u00e9changes d\u2019informations et toute corr\u00e9lation se r\u00e9alisent par l\u2019interm\u00e9diaire des zones de contacts,\u00a0 air\/solide (surfaces) et solide\/solide (interfaces). La dynamique des spins aux surfaces et aux interfaces des structures cubiques sont examin\u00e9es en employant la technique dite de raccordement. Les spectres magnoniques et les \u00e9nergies des \u00e9tats localis\u00e9s de spins (\u00e0 la surface et \u00e0 l\u2019interface) sont d\u00e9termin\u00e9s et discut\u00e9s en fonction des diff\u00e9rents param\u00e8tres caract\u00e9risant les cristaux cubiques semi-infinis. Les interactions entre les \u00e9tats localis\u00e9s de spins et les modes de magnons des structures parfaites font appara\u00eetre dans les spectres magn\u00e9tiques plusieurs pics et oscillations. Certains pics sont identifi\u00e9s comme \u00e9tant des r\u00e9sonances de type Fano.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #ff0000\"><strong>Mots-cl\u00e9s<\/strong>\u00a0<\/span>: Surfaces et interfaces, Ondes de spin\u00a0; Spectres magn\u00e9tiques\u00a0; Etats localis\u00e9s<\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_accordion_item][et_pb_accordion_item title=\u00a0\u00bbThesis Summury\u00a0\u00bb open_toggle_text_color=\u00a0\u00bb#E02B20&Prime; _builder_version=\u00a0\u00bb4.25.1&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb toggle_text_align=\u00a0\u00bbjustify\u00a0\u00bb open=\u00a0\u00bboff\u00a0\u00bb]<\/p>\n<p><strong><span style=\"color: #ff0000\">Abstract<\/span><\/strong><\/p>\n<p>The magnetic properties of materials are strongly dependent on the geometry of the crystal structure and the arrangements of the atomic sites. Within the same material, the properties are also sensitive to variation in concentration and atomic environment.<\/p>\n<p>At the surface and interface, the change in symmetry and the reduction in coordination lead to a large change in the physical properties of materials. Additional energy states are observed on the dynamic spectra of the different spin assemblies. Because, the modification of the atomic neighborhood is at the origin of new electronic, vibrational and magnetic properties in all atomic structures.<\/p>\n<p>In this thesis, we carried out a theoretical study on the behavior of spin excitations and their precession movement in cubic structures with ferromagnetic coupling. In particular, we noted the impact of symmetry breaking on the precession of spins in the three crystallographic cubic structures with ferromagnetic coupling.<\/p>\n<p>Today, it is established that in all semi-infinite structures, information exchanges and any correlation are carried out via contact zones, air\/solid (surfaces) and solid\/solid (interfaces). The dynamics of spins at surfaces and interfaces of cubic structures are examined using the matching technique. The magnonic spectra and the energies of the localized spin states (at the surface at the interface zones) are determined and discussed according to the different parameters characterizing semi-infinite cubic lattices. The interactions between localized spin states and the magnon modes of perfect structures reveal several peaks and oscillations in the magnetic spectra. Some peaks are identified as Fano-type resonances.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #ff0000\">Keywords<\/span>: Surfaces and interfaces, Spin waves; Magnetic spectra; Localized spin states<\/p>\n<p>[\/et_pb_accordion_item][\/et_pb_accordion][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mme. CHALLALI RebihaSoutiendra publiquement sa th\u00e8se de Doctorat en sciences en Physique des Mat\u00e9riauxIntitul\u00e9 : \u00ab Spectres magnoniques associ\u00e9s aux surfaces et aux interfaces entres structures cubiques ferromagn\u00e9tiques \u00bbLe : lundi 08 juillet 2024 \u00e0 10h00, \u00e0 la salle de conf\u00e9rences de la facult\u00e9 des sciences de l\u2019UMMTO (Campus Hasnaoua II, dit aussi Bastos). Directeur [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":22670,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1,13,11],"tags":[],"class_list":["post-24705","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe","category-actualites-pg","category-new_dep_physique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AVIS DE SOUTENANCE DE TH\u00c8SE DE DOCTORAT EN SCIENCES EN PHYSIQUE SP\u00c9CIALISTE : Physique des Mat\u00e9riaux DE Mme CHALLALI Rebiha - Facult\u00e9 des Sciences<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ummto.dz\/fs\/avis-de-soutenance-de-these-de-doctorat-en-sciences-en-physique-specialiste-physique-des-materiaux-de-mme-challali-rebiha\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AVIS DE SOUTENANCE DE TH\u00c8SE DE DOCTORAT EN SCIENCES EN PHYSIQUE SP\u00c9CIALISTE : Physique des Mat\u00e9riaux DE Mme CHALLALI Rebiha - Facult\u00e9 des Sciences\" \/>\n<meta property=\"og:description\" content=\"Mme. CHALLALI RebihaSoutiendra publiquement sa th\u00e8se de Doctorat en sciences en Physique des Mat\u00e9riauxIntitul\u00e9 : \u00ab Spectres magnoniques associ\u00e9s aux surfaces et aux interfaces entres structures cubiques ferromagn\u00e9tiques \u00bbLe : lundi 08 juillet 2024 \u00e0 10h00, \u00e0 la salle de conf\u00e9rences de la facult\u00e9 des sciences de l\u2019UMMTO (Campus Hasnaoua II, dit aussi Bastos). 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