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Unraveling the electronic structure and magnetic transition evolution across monolayer, bilayer, and multilayer ferromagnetic Fe3GeTe2

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dc.contributor.authorRoemer, Ryan
dc.contributor.authorLee, Dong Hyun David
dc.contributor.authorSmit, Steef
dc.contributor.authorZhang, Xiyue
dc.contributor.authorGodin, Simon
dc.contributor.authorHamza, V
dc.contributor.authorJian, Tianyi
dc.contributor.authorLarkin, Josiah
dc.contributor.authorShin, H
dc.contributor.authorLiu, Chong
dc.contributor.authorMichiardi, Matteo
dc.contributor.authorLevy, Giorgio
dc.contributor.authorZhang, Zhan
dc.contributor.authorGreen, Robert
dc.contributor.authorKim, C
dc.contributor.authorMuller, David
dc.contributor.authordamascelli, andrea
dc.contributor.authorHan, Myung Joon
dc.contributor.authorZou, Ke
dc.date.accessioned2024-10-23T02:36:21Z
dc.date.available2024-10-23T02:36:21Z
dc.date.issued2024-09-30
dc.description.abstractTwo-dimensional (2D) van der Waals (vdW) magnets have sparked widespread attention due to their potential in spintronic applications as well as in fundamental physics. Ferromagnetic vdW compound Fe3GeTe2 (FGT) and its Ga variants have garnered significant interest due to their itinerant magnetism, correlated states, and high magnetic transition temperature. Experimental studies have demonstrated the tunability of FGT’s Curie temperature, TC, through adjustments in quintuple layer numbers (QL) and carrier concentrations, n. However, the underlying mechanism remains elusive. In this study, we employ molecular beam epitaxy (MBE) to synthesize 2D FGT films down to 1 QL with precise layer control, facilitating an exploration of the band structure and the evolution of itinerant carrier density. Angle-resolved photoemission spectroscopy (ARPES) reveals significant band structure changes at the ultra-thin limit, while first-principles calculations elucidate the band evolution from 1 QL to bulk, largely governed by interlayer coupling. Additionally, we find that n is intrinsically linked to the number of QL and temperature, with a critical value triggering the magnetic phase transition. Our findings underscore the pivotal role of band structure and itinerant electrons in governing magnetic phase transitions in such 2D vdW magnetic materials.
dc.description.sponsorshipMax Planck-UBC-UTokyo Center for Quantum Materials and the Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program Natural Sciences and Engineering Research Council of Canada (NSERC) Canada Foundation for Innovation (CFI) British Columbia Knowledge Development Fund (BCKDF) Department of National Defence (DND) Canada Research Chairs Program Gordon and Betty Moore Foundation’s EPiQS Initiative CIFAR Quantum Materials Program Canadian Institutes of Health Research (CIHR) Government of Saskatchewan University of Saskatchewan
dc.description.versionPeer Reviewed
dc.identifier.doihttps://doi.org/10.1038/s41699-024-00499-0
dc.identifier.urihttps://hdl.handle.net/10388/16201
dc.language.isoen
dc.publishernpj 2D Materials and Applications volume
dc.subjectmagnets
dc.subjectangle-resolved photoemission spectroscopy
dc.subjectquintuple layer numbers
dc.titleUnraveling the electronic structure and magnetic transition evolution across monolayer, bilayer, and multilayer ferromagnetic Fe3GeTe2
dc.typeArticle

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