Coexisting Non-Trivial Van der Waals Magnetic Orders Enable Field-Free Spin-Orbit Torque Magnetization Dynamics
Journal article, 2025
The discovery of van der Waals (vdW) magnetic materials exhibiting non-trivial and tunable magnetic interactions can lead to exotic magnetic states that are not readily attainable with conventional materials. Such vdW magnets can provide a unique platform for studying new magnetic phenomena and realizing magnetization dynamics for energy-efficient and non-volatile spintronic memory and computing technologies. Here, the coexistence of ferromagnetic and antiferromagnetic orders in vdW magnet (Co0.5Fe0.5)5-xGeTe2 (CFGT) above room temperature, inducing an intrinsic exchange bias and canted perpendicular magnetism is discovered. Such non-trivial intrinsic magnetic order enables to realize energy-efficient, magnetic field-free, and deterministic spin-orbit torque (SOT) switching of CFGT in heterostructure with Pt. These experiments, in conjunction with density functional theory and Monte Carlo simulations, demonstrate the coexistence of non-trivial magnetic orders in CFGT, which enables field-free SOT magnetization dynamics in spintronic devices.
(Co0.5Fe0.5)5-xGeTe2
ferromagnet
exchange bias
room temperature
field-free magnetization switching
2D magnets
anti-ferromagnet
spin-orbit torque
Author
Bing Zhao
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Lakhan Bainsla
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Indian Institute of Technology
Soheil Ershadrad
Uppsala University
Lunjie Zeng
Chalmers, Physics, Nano and Biophysics
Roselle Ngaloy
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
P Svedlindh
Uppsala University
Eva Olsson
Chalmers, Physics, Nano and Biophysics
Biplab Sanyal
Uppsala University
Saroj Prasad Dash
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Advanced Materials
09359648 (ISSN) 15214095 (eISSN)
Vol. In Press 2502822Graphene Core Project 3 (Graphene Flagship)
European Commission (EC) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.
2D material-based technology for industrial applications (2D-TECH)
GKN Aerospace Sweden (2D-tech), 2021-01-01 -- 2024-12-31.
VINNOVA (2019-00068), 2020-05-01 -- 2024-12-31.
VINNOVA (2024-03852), 2023-11-01 -- 2029-12-31.
Spintronics with Topological Quantum Material and Magnetic Heterostructures
Swedish Research Council (VR) (2021-04821), 2022-01-01 -- 2025-12-31.
ARTEMI - a National Research Infrastructure in Electron Microscopy
Swedish Foundation for Strategic Research (SSF) (RIF21-0026), 2022-09-01 -- 2027-12-31.
Swedish Research Council (VR) (2021-00171), 2022-01-01 -- 2026-12-31.
2Dimensional van der Waals Spin-Orbit Torque Technology
Swedish Research Council (VR) (2021-05925), 2021-12-01 -- 2024-11-30.
Topology and Magnetism in Novel Quantum Materials
Swedish Research Council (VR) (2018-07046), 2020-01-01 -- 2021-12-31.
2D Heterostructure Non-volatile Spin Memory Technology (2DSPIN-TECH)
European Commission (EC) (EC/HE/101135853), 2023-12-01 -- 2026-11-30.
Subject Categories (SSIF 2025)
Condensed Matter Physics
DOI
10.1002/adma.202502822