Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)
MA 11.14: Vortrag
Dienstag, 18. März 2025, 13:00–13:15, H18
Tuning of spin transport properties in 2D ferromagnet VSe2 by structural polytypes of TaS2 electrodes — •Biplab Sanyal and Masoumeh Davoudiniya — Department of Physics & Astronomy, Ångströmlaboratoriet, Uppsala University, Box-516, 75120 Uppsala, Sweden
2D magnets and their heterostructures are promising materials for future spintronic applications. Here, we present a study of spin transport through a ferromagnetic monolayer of 1T-VSe2 with two structural polytypes of TaS2 electrodes stacked in van der Waals heterostructures. Using density functional theory coupled with the nonequilibrium Green function framework, we explore the impact of TaS2 electrode polytypes on the device’s quantum transport properties. We observe that devices with 1T-TaS2 electrodes exhibit higher spin-dependent transmission compared to 2H-TaS2 electrodes. Incorporating MoS2 as a tunnel barrier, anisotropic tunnel magnetoresistance enhances significantly, reaching 168% for the 1T-device and 1419% for the 2H-device. Spin-transfer torque (STT) analysis shows that its magnitude is highest at 90∘ (−702 µeV/V for 1T and −1561 µeV/V for 2H devices) and decreases towards 180∘. The 1T-device shows superior performance with lower Gilbert damping, reduced critical current density and voltage for magnetization switching, compared to the 2H-device, which requires significantly higher current and voltage. Our predictions reveal the potential of 1T-VSe2-based heterostructures for advanced spintronic applications.
Keywords: Spin transfer torque; 2D magnet VSe2; Anisotropic tunnel magnetoresistance; Non-equilibrium Green function; van der Waals heterostructures