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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260619T093000
DTEND;TZID=Europe/Paris:20260619T103000
DTSTAMP:20260619T195904
CREATED:20260529T151254Z
LAST-MODIFIED:20260529T151254Z
UID:10000178-1781861400-1781865000@sfp-alpes.fr
SUMMARY:Alain WALCARIUS (Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l’Environnement (LCPME)\, UMR Université de Lorraine-CNRS 7564\, Equipe Chimie et Electrochimie Analytiques\, Nancy)
DESCRIPTION:Intérêt des membranes de silice à porosité orientée en électrochimie analytique et au delà\n_ \nContact : andrew.gross@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/alain-walcarius-laboratoire-de-chimie-physique-et-microbiologie-pour-les-materiaux-et-lenvironnement-lcpme-umr-universite-de-lorraine-cnrs-7564-equipe-chimie-et-electrochimie-analytiques/
LOCATION:DCM – Bât Nanobio\, DCM 570 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260619T100000
DTEND;TZID=Europe/Paris:20260619T110000
DTSTAMP:20260619T195904
CREATED:20260529T130829Z
LAST-MODIFIED:20260529T130829Z
UID:10000169-1781863200-1781866800@sfp-alpes.fr
SUMMARY:Soutenance HDR de Julien PERARD (Irig/LCBM)
DESCRIPTION:From iron to biohydrogen: how bacteria are inspiring the biotechnologies of tomorrow\nRésumé : \nMicroorganisms play a crucial role in biotechnologies\, enabling the transformation of matter into high-value gases and biomass. At a time when the climate emergency demands a rethinking of our energy models\, my work is part of a responsible research approach\, aiming to reconcile scientific excellence\, environmental sustainability\, and economic viability.​\nOver the past twelve years\, I have dedicated my career to understanding the molecular mechanisms of the Fur and SUF systems (Fe-S cluster biogenesis\, bacterial virulence) and to studying nickel insertion into CO dehydrogenase\, using integrated structural approaches (SAXS\, MALLS\, crystallography). Since 2021\, I have refocused my research on energy biotechnologies. After a brief overview of my scientific journey\, I will detail my projects on developing solutions for BioH₂ production and CO₂ valorization\, particularly through the « Bioraffinery » project (combining photofermentation and methanogenesis)\, inspired by my participation in the 2022 EIC Horizon Prize. I have optimized photobioreactors (PBRs)\, improving their light efficiency and achieving up to 5 mol H₂/mol of substrate from PLA waste.​\nToday\, I am working on optimizing microbial strains and culture conditions\, as well as integrating circular processes for the joint production of BioH₂/BioCH₄. In collaboration with Génoscope\, CEA Tech\, and industrial partners\, I have developed advanced biorafineries to convert by-products into biofuels.​\nMy work\, at the interface of biophysics\, enzymology\, and engineering\, is part of a decarbonized bioeconomy approach.​ \n_ \nContact : alain.farchi@cea.fr
URL:https://sfp-alpes.fr/event/soutenance-hdr-de-julien-perard-irig-lcbm/
LOCATION:DCM – Bât Nanobio\, DCM 570 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Soutenance,Soutenance HDR
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260619T110000
DTEND;TZID=Europe/Paris:20260619T120000
DTSTAMP:20260619T195904
CREATED:20260604T132608Z
LAST-MODIFIED:20260604T133618Z
UID:10000184-1781866800-1781870400@sfp-alpes.fr
SUMMARY:Jonathan HOME (ETH Zürich)
DESCRIPTION:Scaling trapped-ion quantum computers\nRésumé : \nTrapped ions are among the most promising paths to realizing quantum computers\, having exhibited the highest fidelity gates and long coherence times. Scaling up will require the adoption of new technologies\, and can be facilitated by new approaches. In this talk I will describe recent work from our group in both directions. Firstly I will describe the use of integrated optics to deliver light to multiple zones of an ion trap chip in scalable manner\, and give an impression of the new types of control which might be enabled by this approach 1\,2\,3. I will then introduce a new concept for scaling trapped-ion quantum computers based on microfabricated Penning traps\, introducing flexible 2-dimensional ion transport while removing the need for high-voltage radio-frequency fields and thus improving compatibility with standardized chip fabrication 4\,5. We have used this to perform sensing of both static and oscillating magnetic and electric fields near the chip surface\, and more recently demonstrated multi-qubit gates and control of multi-dimensional arrays of ions. \n1 K. Mehta et al. Nature 586\, 533–537 (2018)\n2 A. Ricci et al. Phys. Rev. Lett. 130\, 133201 (2023)\n3 C. Mordini et al. Physical Review X 15\, 011040 (2025)\n4 S. Jain et al. Physical Review X 10\, 031027 (2021)\n5 S. Jain et al. Nature 627\, 8004\, pp. 510–514 (2024) \n_ \nContact : michele.filippone@cea.fr
URL:https://sfp-alpes.fr/event/jonathan-home-eth-zurich/
LOCATION:GreenER – Amphi Bergès\, GreenER\, 21 avenue des Martyrs\, Grenoble\, 38031\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260619T140000
DTEND;TZID=Europe/Paris:20260619T160000
DTSTAMP:20260619T195904
CREATED:20260529T145132Z
LAST-MODIFIED:20260529T145509Z
UID:10000175-1781877600-1781884800@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Marco BIAGI (IRIG/Spintec)
DESCRIPTION:Exploration of orbital-to-spin conversion materials and integration in 3-terminal spin-orbit torque magnetic tunnel junctions\nRésumé : \nThe development of electrically controlled nanomagnets for spintronic applications\, particularly non-volatile magnetic memories (MRAM)\, is attracting strong interest due to the limitations of CMOS-based memories such as SRAM and eDRAM. Spin–orbit torque (SOT) MRAMs are promising candidates for addressing SRAM specifications; however\, current materials still suffer from limited efficiency and high resistivity\, leading to unmet write-current requirements. Recently\, studies have highlighted orbital phenomena as a potential route to enhance SOT efficiency\, owing to their larger magnitudes and availability in a broader set of materials. However\, orbital currents do not couple to magnetization in the absence of spin–orbit coupling\, requiring an orbital-to-spin conversion layer\, which motivates studies of conversion mechanisms and associated physics. \nIn this PhD work\, we evaluate promising orbital/HM/FM material systems for SOTMRAM applications. We present a comprehensive study of Ru/HM/FeCoB and Ta/W/ FeCoB systems\, where Ru and Ta act as orbital current sources\, while Ta\, W\, and Pt serve as orbital-to-spin conversion layers. Ru is predicted to exhibit one of the largest orbital Hall angles among transition metals while maintaining low resistivity. Ta\, a heavy metal with a large spin Hall effect\, is predicted to exhibit an orbital Hall angle approximately one order of magnitude larger than its spin counterpart. When a heavy metal is used as a conversion layer\, multiple spin-current contributions can coexist and add linearly to the total effective spin Hall conductivity\, potentially enhancing the overall SOT efficiency. \nWe characterized key parameters relevant to SOT magnetic tunnel junctions (MTJ) devices\, including saturation magnetization\, effective anisotropy field\, and resistivity\, and we quantified damping-like (ξDL) and field-like (ξFL) SOT efficiencies as a function of orbital and conversion layer thickness\, both in as-deposited and 300°C annealed samples. These metrics are benchmarked against reference HM/FeCoB systems to isolate the effect of the additional orbital layer. For Ru/Ta and Ru/W stacks\, limited enhancement ξFL of ξDL is observed relative to reference systems. In contrast\, Ru/Pt exhibits a twofold increase in ξDL compared to Pt alone. This difference is attributed to the stronger SOC in Pt\, which enables more efficient orbital-to-spin conversion. The independence of ξDL on Ru thickness further suggests an interfacial origin of the orbital contribution in Ru/Pt. However\, thermal annealing strongly degrades ξDL\, limiting its applicability for SOT-MRAM. In Ta/W systems\, we observe a strong enhancement of ξDL by a factor of 4.4 relative to Ta and 3.2 relative to W. A parallel-resistor model indicates that conventional SHE contributions cannot fully account for this increase\, pointing to an additional orbital-related mechanism. Extending the study to 400 °C annealing shows that ξDL remains largely stable\, indicating good thermal robustness while maintaining perpendicular magnetic anisotropy. \nLeveraging these advantages\, we further integrate the Ta/W system into SOT-MTJs and benchmark it against standard W-based MTJs. We investigate the pulse-length dependence of the critical switching current and provide a first demonstration of integrated orbital-to-spin conversion in SOT-MTJs. Ta/W devices exhibit switching currents comparable to W-based devices but have a lower switching current density and improved perpendicular magnetic anisotropy stability. Finally\, we present a proof-of-concept for vertical non-local switching of SOT-MTJ using orbital torques\, simplifying bottom-pinned SOT-MRAM fabrication. Overall\, these results demonstrate that orbital physics can be exploited to enhance SOT-MTJ performance\, simplify fabrication\, and provide a promising route toward scalable bottom-pinned MRAM technologies. \nPlus d’information : https://www.spintec.fr/phd-defense-exploration-of-orbital-to-spin-conversion-materials-and-integration-in-3-terminal-spin-orbit-torque-magnetic-tunnel-junctions/ \nPour suivre la soutenance ​​​en visioconférence : https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09 \n_ \n\n\nP​resential access to the confere​nce room at CEA in Gre​​noble requires an entry authorization\, request to admin.spintec@cea.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-marco-biagi-irig-spintec/
LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, Laboratoire Irig/Spintec\, salle de séminaire 445\, bâtiment 1005\, CEA-Grenoble\, Grenoble
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
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