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Multidirectional Spin-Orbit Torque Magnetization Dynamics in beyond Room Temperature Van der Waals Magnet Devices
Bing Zhao1, Lakhan Bainsla1,2, Soheil Ershadrad3,4
1Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296Göteborg, Sweden.
Abstract:
van der Waals (vdW) magnets with room-temperature ferromagnetism offer exciting opportunities for energy-efficient spintronic devices, yet their magnetization dynamics remain largely unexplored despite their importance for high-speed memory technologies. Here, we investigate spin-orbit torque phenomena in the room-temperature vdW magnet (Co0.15Fe0.85)5GeTe2 (CFGT)/Pt heterostructure using spin-torque ferromagnetic resonance and second-harmonic Hall measurements. Alongside a conventional in-plane spin Hall conductivity of 3.68 × 105 (ℏ/2e) (Ω m)-1, we identify a sizable out-of-plane component of -0.33 × 105 (ℏ/2e) (Ω m)-1 that generates unconventional damping-like torques. Density functional theory and Monte Carlo simulations suggest that this torque can originate from interface-induced spin reorientation arising from a modified magnetic anisotropy landscape and strongly enhanced Dzyaloshinskii-Moriya interaction at the CFGT/Pt interface. The combination of low effective magnetization (0.321 T), moderate Gilbert damping (0.027), and efficient multidirectional torques highlights vdW magnets as promising platforms for next-generation spintronic devices.
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