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DTSTART;VALUE=DATE:20260703
DTEND;VALUE=DATE:20260704
DTSTAMP:20260710T020857
CREATED:20260624T101733Z
LAST-MODIFIED:20260624T101733Z
UID:6492-1783036800-1783123199@www.cnrs-imn.fr
SUMMARY:Thesis Defense by Bastien Anezo
DESCRIPTION:Bastien Anezo (PMN team) will defend his doctoral dissertation titled: “Simulation and Development of Azafullerene Qubits on Diamond Substrates.” \n  \n  \n 
URL:https://www.cnrs-imn.fr/en/event/thesis-defense-by-bastien-anezo/
LOCATION:Lecture Hall 1\, IRESTE Chantrerie Building
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DTSTART;TZID=Europe/Paris:20260703T100000
DTEND;TZID=Europe/Paris:20260703T130000
DTSTAMP:20260710T020857
CREATED:20260629T130420Z
LAST-MODIFIED:20260630T144249Z
UID:6557-1783072800-1783083600@www.cnrs-imn.fr
SUMMARY:HDR Defense by Emmanuel BERTRAND (ID2M)
DESCRIPTION:Studies of the relationships between process\, microstructure\, and mechanical properties of metals.\nThe Role of Deformation Mechanisms and Wire-Arc Additive Manufacturing. \nAbstract: Among the broad family of metal alloys\, some are subject to specific deformation mechanisms: stress-induced martensitic transformation\, reorientation twinning\, plastic twinning\, etc. These mechanisms give rise to very specific mechanical behaviors: shape memory effect\, superelasticity\, and TRIP- and/or TWIP-effect alloys. \nTo gain a better understanding of these often concurrent mechanisms\, my approach involved studying the sequences of deformation mechanisms in β-metastable titanium alloys. I then turned my attention to the relationships between an alloy’s chemical composition and its deformation mechanisms before expanding my research to other martensitic-transforming alloys.  \nAnother part of my work involves developing solutions to problems caused by the behavior of metal alloys in additive manufacturing. Depending on the metals in question\, the issues vary: a decrease in mechanical properties\, anisotropy resulting from solidification behavior\, heat accumulation\, and so on.  \nOriginal solutions are proposed at the intersection of materials science and process engineering. This approach enables a detailed understanding of the relationships between process\, microstructure\, and metal properties\, and helps overcome scientific and technological barriers.  \nKeywords: titanium alloys; wire arc additive manufacturing; metallurgy; microstructure \n\nStudies of the relationships between process\, microstructure\, and mechanical properties of metals.\nThe Role of Deformation Mechanisms and Wire Arc Additive Manufacturing \nAbstract: Among the large family of metal alloys\, some are subject to specific deformation mechanisms: stress-induced martensitic transformation\, reorientation twinning\, plastic twinning… These mechanisms give rise to very specific mechanical behaviors: shape memory effect\, superelasticity\, and TRIP and/or TWIP alloys.  \nTo gain a better understanding of these often concurrent mechanisms\, my approach involved studying the sequence of deformation mechanisms in metastable β-titanium alloys. I then focused on the relationships between an alloy’s chemical composition and its deformation mechanisms before expanding my analysis to other alloys undergoing martensitic transformation.  \nAnother part of my work involves developing solutions to problems caused by the behavior of metal alloys in additive manufacturing. Depending on the metals in question\, the issues vary: reduced mechanical properties\, anisotropy resulting from solidification behavior\, heat accumulation\, etc.  \nOriginal solutions are proposed by operating at the interface between materials science and process engineering. This approach enables a detailed understanding of the relationships between process\, microstructure\, and the properties of metals\, and helps overcome scientific and technological barriers.  \nKeywords: titanium alloys; wire arc additive manufacturing; metallurgy; microstructure
URL:https://www.cnrs-imn.fr/en/event/hdr-defense-by-emmanuel-bertrand-id2m/
LOCATION:Lecture Hall 1\, IRESTE Chantrerie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/02/bertrand_emmanuel.jpg
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DTSTART;TZID=Europe/Paris:20260703T133000
DTEND;TZID=Europe/Paris:20260703T163000
DTSTAMP:20260710T020857
CREATED:20260626T150629Z
LAST-MODIFIED:20260630T144457Z
UID:6534-1783085400-1783096200@www.cnrs-imn.fr
SUMMARY:Thesis Defense by Bastien ANEZO (PMN)
DESCRIPTION:Simulation and Development of Azafullerene Qubits on Diamond Substrates\nAbstract: Azafullerene (C59N) is a spin-active\, radical species belonging to the fullerene family. The delocalized spin ½ on the cage is a two-level system that can be manipulated as a qubit. The stability of C59N is enhanced by using a protective molecule\, [10]CPP; through supramolecular noncovalent interactions\, these two molecules form the C59N⊂[10]CPP complex. This structure possesses the same spin characteristics as azafullerene\, while remaining stable at room temperature for years. This is why C59N⊂[10]CPP shows promise in the fields of molecular electronics\, quantum information processing (QIP)\, and nanomagnets. In particular\, we are studying the implementation of a molecular spin measurement system using fluorescence from colored defects in diamond.\nIn this thesis\, first-principles calculations using density functional theory (DFT) reveal the electronic stability (charge and spin) of C59N and the NV center in diamond. NV-center fluorescence microscopy provides information on the characteristics of C59N and reveals charge instability dependent on the surface chemistry of diamond. We study surfaces such as Au(111)\, Ag(111)\, FeO(001)\, and graphene\, onto which [10]CPP and then C59N are deposited to create a monolayer of C59N⊂[10]CPP. The deposits are characterized by STM\, XPS\, and NEXAFS\, revealing complex and variable structures in which the structure of C59N⊂[10]CPP depends on the deposition and annealing conditions. The supramolecular complex retains its spin activity depending on the surface used.          \nKeywords: ab initio\, density functional theory\, supramolecular complex\, color defect\, NV center\, magnetic resonance \n\nSimulation and Development of Azafullerene Qubits on Diamond Substrates\nAbstract: Azafullerene (C59N) is a spin-active molecule—a radical species—from the fullerene family. The delocalized spin of ½ on the cage constitutes a two-level system that can be manipulated as a qubit. The stability of C59N is enhanced by using a protective molecule\, [10]CPP; through non-covalent supramolecular interactions\, these two molecules form the C59N⊂[10]CPP complex. This structure retains the same spin characteristics as azafullerene\, while remaining stable at room temperature for years. This is why C59N⊂[10]CPP shows promise in the fields of molecular electronics\, quantum information processes (QIP)\, and nanomagnets. In particular\, we are studying the implementation of a molecular spin measurement system using fluorescence from color centers in diamond.\nIn this thesis\, first-principles calculations using density functional theory (DFT) reveal the electronic stability (charge and spin) of C59N and the NV center in diamond. Fluorescence microscopy of the NV center provides information on the characteristics of C59N and reveals charge instability depending on the surface chemistry of diamond. We study surfaces such as Au(111)\, Ag(111)\, FeO(001)\, and graphene\, onto which [10]CPP and then C59N are deposited to form a monolayer of C59N⊂[10]CPP. The deposits are characterized by STM\, XPS\, and NEXAFS; they reveal complex and variable phases in which the structure of C59N⊂[10]CPP depends on the deposition and annealing conditions. The supramolecular complex retains its spin activity depending on the surface used.          \nKeywords: ab initio\, density functional theory\, supramolecular complex\, color center\, NV center\, magnetic resonance
URL:https://www.cnrs-imn.fr/en/event/thesis-defense-by-bastien-anezo-pmn/
LOCATION:Amphi IMN Lombarderie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/02/anezo_bastien.jpg
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