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

• DOI: 10.48550/arxiv.2310.19618
• Publication Date: 2023-01-01
• Authors: Roselle Ngaloy; Bing Zhao; Soheil Ershadrad; Rahul Gupta; Masoumeh Davoudiniya; Lakhan Bainsla; Lars Sjöström; Md. Anamul Hoque; Alexei Kalaboukhov; Peter Svedlindh; Biplab Sanyal; Saroj P. Dash
• Keywords: Spin valve; Magnetocrystalline anisotropy

Van der Waals (vdW) magnets are promising owing to their tunable magnetic properties with doping or alloy composition, where the strength of interactions, symmetry, and anisotropy can be tuned according desired application. However, most vdW magnet based spintronic devices so far limited cryogenic temperatures anisotropies favouring out-of-plane canted orientation magnetization. Here, we report room-temperature lateral spin-valve strong in-plane ferromagnet (Co0.15Fe0.85)5GeTe2 (CFGT) in heterostructures graphene. Magnetization measurements reveal above ferromagnetism CFGT a anisotropy. Density functional theory calculations show that magnitude depends on Co concentration is caused by substitution outermost Fe layer. Heterostructures consisting nanolayers graphene were used experimentally realize basic building blocks for spin valve such as efficient injection detection. The transport Hanle precession prove negative polarization at interface graphene, which supported calculated spin-polarized density states CFGT. magnetization room temperature proves its usefulness devices, thus opening further opportunities technologies.