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2023 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 35, no 16, article id 2209113Article in journal (Refereed) Published
Abstract [en]
The discovery of van der Waals (vdW) magnets opened a new paradigm for condensed matter physics and spintronic technologies. However, the operations of active spintronic devices with vdW ferromagnets are limited to cryogenic temperatures, inhibiting their broader practical applications. Here, the robust room-temperature operation of lateral spin-valve devices using the vdW itinerant ferromagnet Fe5GeTe2 in heterostructures with graphene is demonstrated. The room-temperature spintronic properties of Fe5GeTe2 are measured at the interface with graphene with a negative spin polarization. Lateral spin-valve and spin-precession measurements provide unique insights by probing the Fe5GeTe2/graphene interface spintronic properties via spin-dynamics measurements, revealing multidirectional spin polarization. Density functional theory calculations in conjunction with Monte Carlo simulations reveal significantly canted Fe magnetic moments in Fe5GeTe2 along with the presence of negative spin polarization at the Fe5GeTe2/graphene interface. These findings open opportunities for vdW interface design and applications of vdW-magnet-based spintronic devices at ambient temperatures.
Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2023
Keywords
2D magnets, Fe5GeTe2, graphene, Hanle spin precession, spin-valve, van der Waals heterostructures, van der Waals magnets
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-511082 (URN)10.1002/adma.202209113 (DOI)000945738100001 ()36641649 (PubMedID)
Funder
Vinnova, 2019-00068Swedish Research Council, 2021-04821Knut and Alice Wallenberg FoundationSwedish Research Council, 2022-04309Swedish Research Council, 2021-04658Swedish Research Council, 2018-05973Swedish National Infrastructure for Computing (SNIC), SNIC 2021/3-38
2023-09-072023-09-072023-09-07Bibliographically approved