Deterministic switching of a perpendicularly polarized magnet using unconventional spin-orbit torques in WTe 2 .

Autor: Kao IH; Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA., Muzzio R; Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA., Zhang H; Department of Electrical and Computer Engineering, University of California Riverside, Riverside, CA, USA., Zhu M; Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA., Gobbo J; Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA., Yuan S; Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA., Weber D; Department of Chemistry, The Ohio State University, Columbus, OH, USA.; Battery and Electrochemistry Laboratory (BELLA), Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany., Rao R; Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH, USA., Li J; Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, KS, USA., Edgar JH; Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, KS, USA., Goldberger JE; Department of Chemistry, The Ohio State University, Columbus, OH, USA., Yan J; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.; Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, USA., Mandrus DG; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.; Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, USA., Hwang J; Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA., Cheng R; Department of Electrical and Computer Engineering, University of California Riverside, Riverside, CA, USA.; Department of Physics and Astronomy, University of California Riverside, Riverside, CA, USA., Katoch J; Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA., Singh S; Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA. simranjs@andrew.cmu.edu.
Jazyk: angličtina
Zdroj: Nature materials [Nat Mater] 2022 Sep; Vol. 21 (9), pp. 1029-1034. Date of Electronic Publication: 2022 Jun 16.
DOI: 10.1038/s41563-022-01275-5
Abstrakt: Spin-orbit torque (SOT)-driven deterministic control of the magnetic state of a ferromagnet with perpendicular magnetic anisotropy is key to next-generation spintronic applications including non-volatile, ultrafast and energy-efficient data-storage devices. However, field-free deterministic switching of perpendicular magnetization remains a challenge because it requires an out-of-plane antidamping torque, which is not allowed in conventional spin-source materials such as heavy metals and topological insulators due to the system's symmetry. The exploitation of low-crystal symmetries in emergent quantum materials offers a unique approach to achieve SOTs with unconventional forms. Here we report an experimental realization of field-free deterministic magnetic switching of a perpendicularly polarized van der Waals magnet employing an out-of-plane antidamping SOT generated in layered WTe 2 , a quantum material with a low-symmetry crystal structure. Our numerical simulations suggest that the out-of-plane antidamping torque in WTe 2 is essential to explain the observed magnetization switching.
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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