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DTSTART;TZID=Europe/Paris:20241219T093000
DTEND;TZID=Europe/Paris:20241219T120000
DTSTAMP:20260412T233337
CREATED:20241206T093719Z
LAST-MODIFIED:20241213T093919Z
UID:11313-1734600600-1734609600@fermi.univ-tlse3.fr
SUMMARY:Nanostructured metallic materials for hydrogen storage: synthesis\, characterisation and economic strategy for co-investment.- (May-Line Grapotte / LPCNO / Thesis). - 19/12/2024\, 9H30
DESCRIPTION:PhD defense \nMay-Line GRAPOTTE\, Soutenance à Huis clos \nJury members \n\nFabien DELPECH\, Professeur des universités\, Université Toulouse III – Paul Sabatier\, Directeur de thèse\nChloé THIEULEUX\, Directrice de recherche\, CNRS Rhône Auvergne\, Rapporteur\nPhilippe MIELE\, Professeur des universités\, Université de Montpellier\, Rapporteur\nKarine PHILIPPOT\, Directrice de recherche\, CNRS Occitanie Ouest\, Examinateur\n\nAbstract:\nGlobal warming is a major challenge for the 21st century\, making the reduction of CO2 emissions an absolute priority. Hydrogen is playing an increasingly important role in this energy transition. However\, its use requires efficient storage methods. Current approaches\, such as high-pressure gaseous storage and cryogenic storage\, present significant risks and limitations. Solid-state storage offers a promising alternative\, but faces challenges in terms of reversibility and thermal management. \nIn this thesis\, we explored manganese-based nanostructured metallic materials for reversible hydrogen storage\, with the aim of overcoming the limitations of existing storage methods in terms of safety and efficiency. These materials are of particular interest because of their ability to form Kubas-type interactions with hydrogen\, thus combining the size effects of nanomaterials with the intrinsic properties of manganese. Our research focused on two main aspects: firstly\, the study of manganese hydride\, a promising material for storage\, and secondly\, the synthesis and exploration of the properties of manganese nanoparticles. \nAn economic study was also carried out. The economic impact of adopting hydrogen in the transport sector was studied\, with particular attention paid to the phenomenon of co-investment. This type of investment is necessary if all the players in the value chain are to be able to cope with the scale of the costs and benefit from the advantages of this technology..
URL:https://fermi.univ-tlse3.fr/event/nanostructured-metallic-materials-for-hydrogen-storage-synthesis-characterisation-and-economic-strategy-for-co-investment-may-line-grapotte-lpcno-thesis-19-12-2024-9h30/
CATEGORIES:Events,HDR / Thesis,LPCNO
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DTSTART;TZID=Europe/Paris:20241219T140000
DTEND;TZID=Europe/Paris:20241219T160000
DTSTAMP:20260412T233337
CREATED:20241206T085135Z
LAST-MODIFIED:20241212T101523Z
UID:11147-1734616800-1734624000@fermi.univ-tlse3.fr
SUMMARY:Ultra-fast all optical switching in spintronic devices. - ( Stéphane Mangin  / LPCNO / Seminar). - 19/12/2024\, 14H.
DESCRIPTION:Séminaire LPCNO \nStéphane Mangin Institut Jean Lamour\, Nancy \n GP seminar room\, INSA\, Build. 27\, Room 2.20 (2nd floor left)\n \nAbstract \nWe will focus exclusively on deterministic magnetization switching induced by single femtosecond or picosecond laser pulses in spintronic devices\, such as spin valves and tunnel junctions. We will examine magnetization reversal resulting from the direct interaction between the ultra-short laser pulse and the magnetization\,. We’ll also discuss how light can produce heat pulses or spin-polarized femtosecond current pulses to reverse the magnetization of thin ferromagnetic films in magnetic heterostructures\, a topic also recently reviewed. Additionally\, we will present our latest results\, which demonstrate ultra-fast magnetization reversal (in less than one picosecond) in various perpendicularly magnetized ferrimagnetic and ferromagnetic spin-valve structures [1\,2]. \nMore recently\, we have demonstrated optically induced ultrafast magnetization reversal occurring in less than a picosecond in rare-earth-free archetypal spin valves ([Pt/Co]/Cu/[Co/Pt]) commonly utilized for current-induced spin-transfer torque (STT) switching [2]. We discovered that the magnetization of the free layer can be switched from parallel to antiparallel alignment\, akin to STT switching\, revealing the presence of an unexpected\, intense\, and ultrafast source of opposite angular momentum in our structures. These findings pave the way for ultrafast magnetization control by integrating concepts from spintronics and ultrafast magnetism. \n[1] Q. Remy\, et al Nature Com 14 445 (2023)\n[19] S. Iihama\, et al Adv. Mater. 30\, 1804004 (2018).\n[20] J. Igarashi\, et al Nano Lett. 20\, 8654 (2020).\n[21] Q. Remy\, et al Adv. Sci. 7\, 2001996 (2020).\n[22] Q. Remy\, Phys. Rev. B 107\, 174431 (2023)\n[23] J. Igarashi et al\, Nature Mat\, 114 36(2023)\n[24] J-X. Lin et al Phys. Rev. Appl. 22 (4)\, 044051 (2024)
URL:https://fermi.univ-tlse3.fr/event/ultra-fast-all-optical-switching-in-spintronic-devices-stephane-mangin-lpcno-seminar-19-12-2024/
LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
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