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<dc:title xml:lang="fr">Dynamique ultrarapide de l'aimantation dans les alliages de métaux de transitions et de terres rares</dc:title>
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<dc:subject xml:lang="fr">Dynamique ultrarapide de l'aimantation</dc:subject>
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<dc:subject xml:lang="en">Ultrafast magnetization</dc:subject>
<dc:subject xml:lang="en">Ultrafast demagnetization</dc:subject>
<dc:subject xml:lang="en">Femtomagnetism</dc:subject>
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<tef:elementdEntree autoriteExterne="027618706" autoriteSource="Sudoc">Métaux de transition</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Mon travail décrit la dynamique de l'aimantation pico et femtoseconde mesurée grâce à la structure temporelle des rayons X. J'ai étudié la désaimantation ultrarapide des métaux de transitions (MT) et des terres rares (TR) dans différents alliages MT-TR sous forme de films minces (~ 20 nm). Mes études reposent principalement sur les techniques expérimentales sensibles à l'aimantation et résolues en temps : tr-XMCD et tr-MCDAD. Ces deux techniques expérimentales offrent par ailleurs une sélectivité chimique qui permet de mesurer séparément la désaimantation ultrarapide des MT et des TR. Elles reposent sur des montages expérimentaux pompe-sonde que j'ai utilisé dans les synchrotrons SOLEIL et BESSY II.</dcterms:abstract>
<dcterms:abstract xml:lang="en">My PhD work describes the pico and femtosecond magnetization dynamics using the time structure of X-rays. I studied the ultrafast demagnetization of thin films (~ 20 nm) for various transitions metals (TM) - rare earths (RE) alloys. My studies have been performed by using two experimental techniques which are sensitive to the magnetization and which are time resolved: tr-XMCD and tr-MCDAD. These two experimental techniques also show chemical selectivity allowing to distinguish the TM and RE dynamics. They are both based on pump-probe experiments which were used at the SOLEIL and BESSY II synchrotrons.</dcterms:abstract>
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