Large out-of-plane spin–orbit torque in topological Weyl semimetal TaIrTe4

Lakhan Bainsla (), Bing Zhao, Nilamani Behera, Anamul Md. Hoque, Lars Sjöström, Anna Martinelli, Mahmoud Abdel-Hafiez, Johan Åkerman and Saroj P. Dash ()
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Lakhan Bainsla: Chalmers University of Technology
Bing Zhao: Chalmers University of Technology
Nilamani Behera: Göteborg
Anamul Md. Hoque: Chalmers University of Technology
Lars Sjöström: Chalmers University of Technology
Anna Martinelli: Chalmers University of Technology
Mahmoud Abdel-Hafiez: University of Sharjah
Johan Åkerman: Göteborg
Saroj P. Dash: Chalmers University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The unique electronic properties of topological quantum materials, such as protected surface states and exotic quasiparticles, can provide an out-of-plane spin-polarized current needed for external field-free magnetization switching of magnets with perpendicular magnetic anisotropy. Conventional spin–orbit torque (SOT) materials provide only an in-plane spin-polarized current, and recently explored materials with lower crystal symmetries provide very low out-of-plane spin-polarized current components, which are not suitable for energy-efficient SOT applications. Here, we demonstrate a large out-of-plane damping-like SOT at room temperature using the topological Weyl semimetal candidate TaIrTe4 with a lower crystal symmetry. We performed spin–torque ferromagnetic resonance (STFMR) and second harmonic Hall measurements on devices based on TaIrTe4/Ni80Fe20 heterostructures and observed a large out-of-plane damping-like SOT efficiency. The out-of-plane spin Hall conductivity is estimated to be (4.05 ± 0.23)×104 (ℏ ⁄ 2e) (Ωm)−1, which is an order of magnitude higher than the reported values in other materials.

Date: 2024
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DOI: 10.1038/s41467-024-48872-3

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