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X-ORIGINAL-URL:https://laboratoire-albert-fert.cnrs-thales.fr/
X-WR-CALNAME:Laboratoire Albert Fert
X-WR-CALDESC:CNRS - Thales
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CLASS:PUBLIC
UID:MEC-0bed45bd5774ffddc95ffe500024f628@laboratoire-albert-fert.cnrs-thales.fr
DTSTART:20261217T140000Z
DTEND:20261217T160000Z
DTSTAMP:20261023T090400Z
CREATED:20261023
LAST-MODIFIED:20261023
PRIORITY:5
SEQUENCE:24
TRANSP:OPAQUE
SUMMARY:PhD defense – Emma Aoustin
DESCRIPTION:On Thursday, December 17, at 15 h (TRT Auditorium), Emma Aoustin will defend her PhD thesis titled “Molecular spintronics : From redox molecular monolayers to switchable magnetic tunnel junctions”, supervised by Richard Mattana and Pierre Seneor.\nJury members:\nStéphane Lenfant, Research Director at IEMN Lille, Reviewer\nSimon Tricard, Research Director at LPCNO Toulouse, Reviewer\nAmandine Bellec, Research Director at MPQ Paris Cité, Examiner\nCéline Dablemont,  Professor at ISMO Orsay, Examiner\nAbstract: \nSpintronics has revolutionized modern electronics by introducing new possibilities for data storage and magnetic sensing technologies. The integration of organic molecules into these junctions has given rise to molecular spintronics, which offers numerous advantages, such as variety, limitless functional possibilities, low cost, and flexibility.\nThis thesis work focuses on the study of self-assembled monolayers (SAMs) of redox-active molecules belonging to the polyoxometalate (POM) family, with particular focus on their transport properties and integration into magnetic tunnel junctions (MTJs). POMs are known for their remarkable redox properties, as they can reversibly accept and donate multiple electrons. The aim of this work is to investigate how POM switching affects the spin-dependent transport properties of spintronic devices. The fundamental concepts of spintronics and molecular spintronics will first be introduced. Following a presentation of the studied molecules, the procedure for functionalizing a ferromagnetic surface with POMs will be described, along with the characterization techniques used to analyze the resulting monolayer. Local electrical characterization will then be performed using CT-AFM, demonstrating that the molecules can be electrically addressed. Reversible switching of molecular conductance has been achieved through both electrical stimulation and UV illumination. In the second part of this work, the molecules will be integrated into complete spintronic devices: NiFe/POM/Co. Transport measurements confirm that conduction through the molecules occurs via tunneling. Under an applied magnetic field, the devices exhibit a clear tunneling magnetoresistance (TMR) signal. Finally, in situ switching of the molecular redox state in the junction modifies its resistance and can influence the TMR signal. These results demonstrate the potential of redox-active molecules for the development of multifunctional and switchable spintronic devices.\n \n
URL:https://laboratoire-albert-fert.cnrs-thales.fr/en/events/phd-defense-maxime-ardisson-857-916-970-297-355/
CATEGORIES:PhD defence
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