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<dc:title xml:lang="en">Suspended antiferromagnetic van der Waals membranes : optical spectroscopy and nanomechanics to probe and control their magnetic properties</dc:title>
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<dc:subject xml:lang="fr">Matériaux 2D magnétiques</dc:subject>
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<dc:subject xml:lang="fr">Spectroscopie Raman</dc:subject>
<dc:subject xml:lang="fr">Spectroscopie de photoluminescence</dc:subject>
<dc:subject xml:lang="fr">Hétérostructures de van der Waals</dc:subject>
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<dc:subject xml:lang="en">Raman spectroscopy</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, nous présentons l’étude de matériaux de van der Waals magnétiques suspendus au-dessus de trous de diamètre micrométrique, formant des nano-résonateurs mécaniques membranaires, comme une plateforme polyvalente pour explorer les interactions entre leurs degrés de liberté mécaniques et magnétiques. Dans un premier temps, nous sondons optiquement la transition de phase magnétique d’échantillons de FePS3 et de NiPS3 de faible épaisseur en combinant spectroscopie Raman et optomécanique. Une contrainte mécanique est ensuite appliquée, dans le but d’observer une modification de la température de transition de phase magnétique induite par des effets de magnétostriction. Enfin, les propriétés de la photoluminescence de NiPS3 sont explorées, notamment son comportement sous contrainte et la résolution spatiale de sa polarisation permettant de mettre en évidence des domaines antiferromagnétiques. Ce travail de thèse met en évidence le potentiel des membranes de van der Waals suspendues pour sonder et contrôler les propriétés physiques de ces matériaux et ouvre vers l’exploration d’effets de proximité dans des hétérostructures magnétiques de van der Waals.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this thesis, we present the investigation of suspended magnetic van der Waals materials on micrometric holes, forming drum-like resonators, as a versatile platform to explore the interplay between their mechanical and magnetic properties. In the first instance, we optically probe the magnetic phase transitions of FePS3 and NiPS3 few-layer samples combining Raman spectroscopy and optomechanics. Strain is then induced to tune the magnetic phase transition temperature induced by magnetostriction effects. Afterwards, the properties of NiPS3 photoluminescence are explored, notably its behavior under strain and the spatial resolution of its polarization that highlights antiferromagnetic domains. This work sheds light on the potential of suspended 2D membranes for probing and controlling the physical properties of these materials and paves the way for the exploration of proximity effects in magnetic van der Waals heterostructures.</dcterms:abstract>
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