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Van der Waals (vdW) magnets are promising owing to their tunable magneticproperties with doping or alloy composition, where the strength of magneticinteractions, their symmetry, and magnetic anisotropy can be tuned according tothe desired application. However, most of the vdW magnet based spintronicdevices are so far limited to cryogenic temperatures with magnetic anisotropiesfavouring out-of-plane or canted orientation of the magnetization. Here, wereport room-temperature lateral spin-valve devices with strong in-planemagnetic anisotropy of the vdW ferromagnet (Co0.15Fe0.85)5GeTe2 (CFGT) inheterostructures with graphene. Magnetization measurements reveal aboveroom-temperature ferromagnetism in CFGT with a strong in-plane magneticanisotropy. Density functional theory calculations show that the magnitude ofthe anisotropy depends on the Co concentration and is caused by thesubstitution of Co in the outermost Fe layer. Heterostructures consisting ofCFGT nanolayers and graphene were used to experimentally realize basic buildingblocks for spin valve devices such as efficient spin injection and detection.The spin transport and Hanle spin precession measurements prove a strongin-plane and negative spin polarization at the interface with graphene, whichis supported by the calculated spin-polarized density of states of CFGT. Thein-plane magnetization of CFGT at room temperature proves its usefulness ingraphene lateral spin-valve devices, thus opening further opportunities forspintronic technologies.

Strong in-plane magnetic anisotropy (Co0.15Fe0.85)5GeTe2/graphene van der Waals heterostructure spin-valve at room temperature