Room-temperature spin-lifetime anisotropy exceeding 60 in bilayer graphene spin valves proximity coupled to WSe 2
Year: 2025
Type: article
Abstract: A spin lifetime anisotropy between in-plane and out-of-plane spins in bilayer graphene (BLG) can be achieved by spin–orbit proximity coupling of graphene to transition metal dichalcogenides. This coupling reduces the in-plane spin lifetime due to proximity-induced spin scattering, while the out-of-plane spin lifetime remains largely unaffected. We show that at room temperature spin lifetime anisotropy exceeds 60 in a BLG lateral spin valve proximity coupled to WSe 2 . The out-of-plane spin lifetime of about 250 ps closely matches that of a BLG reference region not in contact with WSe 2 . In contrast, the estimated in-plane spin lifetime of less than 4 ps leads to a complete suppression of the in-plane spin signal measured at the ferromagnetic Co/MgO spin detector. The proximity coupling of WSe 2 to BLG is particularly promising, as it does not compromise the charge carrier mobility within the graphene channel.
Source: 2D Materials
Institutions: RWTH Aachen University, Forschungszentrum Jülich
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,895
OpenAlex ID: W4414581902