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<dc:title xml:lang="en">Femtosecond magneto-optical four-wave mixing in Garnet films</dc:title>
<dcterms:alternative xml:lang="fr">Mélange à quatre ondes magnéto-optique femtoseconde dans les films de Grenat</dcterms:alternative>
<dc:subject xml:lang="fr">Femtomagnetisme</dc:subject>
<dc:subject xml:lang="fr">Interaction spin-orbite</dc:subject>
<dc:subject xml:lang="fr">Mélange à quatre onde</dc:subject>
<dc:subject xml:lang="fr">Dynamique ultrarapide d’aimantation</dc:subject>
<dc:subject xml:lang="fr">Pompe-sonde</dc:subject>
<dc:subject xml:lang="fr">Dynamique de spins et de charges</dc:subject>
<dc:subject xml:lang="fr">Faraday résolu en temps</dc:subject>
<dc:subject xml:lang="fr">Réponse magnéto-optique cohérente</dc:subject>
<dc:subject xml:lang="en">Femtomagnetism</dc:subject>
<dc:subject xml:lang="en">Spin-orbit interaction</dc:subject>
<dc:subject xml:lang="en">Four-wave mixing</dc:subject>
<dc:subject xml:lang="en">Ultrafast magnetization dynamics</dc:subject>
<dc:subject xml:lang="en">Pump and probe</dc:subject>
<dc:subject xml:lang="en">Spins and charges dynamics</dc:subject>
<dc:subject xml:lang="en">Time-resolved Faraday</dc:subject>
<dc:subject xml:lang="en">Coherent magneto-optical response</dc:subject>
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<tef:elementdEntree autoriteExterne="027282295" autoriteSource="Sudoc">Couches minces</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027871444" autoriteSource="Sudoc">Magnétooptique</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Un des objectifs du Femtomagnetisme est de contrôler l’aimantation des matériaux avec des impulsions laser femtoseconde. Il a été démontré qu’une réponse magnéto-optique (MO) cohérente a lieu avant la thermalisation des populations de spins dans une configuration pompe-sonde MOKE. Elle résulte du couplage cohérent spin-photon dû à l’interaction spin-orbite. Une description simplifiée de cet effet a été faite en tenant compte d’un système à huit niveaux couplés au champ laser. La cohérence MO est définie par le temps de déphasage dépendent du champ T2MO. Dans ce travail, il est montré que la réponse MO cohérente d’un grenat dopé au bismuth peut être mesurée directement avec différentes configurations de mélange à quatre ondes MO. L’importance de connaître la phase spectrale de l’impulsion pour obtenir T2MO a été étudié. Avec des impulsions de 10fs dans le proche infra-rouge, une mesure de T2MO donne (2.8+/-1)fs, c. à d., du même ordre de grandeur que le temps de déphasage des charges.</dcterms:abstract>
<dcterms:abstract xml:lang="en">One of the goals of Femtomagnetism is to manipulate the magnetization of materials using femtosecond optical pulses. It has been shown in ferromagnetic films that a magneto-optical (MO) coherent response takes place before the thermalization of the spins populations in a pump and probe MOKE experiment. It results from the coherent spin-photon coupling mediated by the spin-orbit interaction. A simplified description of this effect has been made by considering an eight-level system coupled with the laser field. The MO coherence can be defined by the magnetic field dependent dephasing time T2MO. In the present work, it is shown that the coherent MO response of a bismuth-doped garnet can be directly measured in different degenerated MO four-wave mixing configurations. The importance of well-knowing the spectral phase of the pulse to measure T2MO was studied. Using 10fs near infra-red pulses, T2MO was shown to be (2.8+/-1)fs that is of the same order of the charges dephasing time.</dcterms:abstract>
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