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Large out-of-plane spin–orbit torque in topological Weyl semimetal TaIrTe4
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Large out-of-plane spin–orbit torque in topological Weyl semimetal TaIrTe4
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Journal Article
Large out-of-plane spin–orbit torque in topological Weyl semimetal TaIrTe4
2024
Overview
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 TaIrTe
4
with a lower crystal symmetry. We performed spin–torque ferromagnetic resonance (STFMR) and second harmonic Hall measurements on devices based on TaIrTe
4
/Ni
80
Fe
20
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)×10
4
(ℏ ⁄ 2
e
) (Ωm)
−1
, which is an order of magnitude higher than the reported values in other materials.
Topological semimetals offer the potential for new-generation spintronic devices. Here, the authors demonstrate a large out-of-plane damping-like spin–orbit torque efficiency in a heterostructure based on the Weyl semimetal TaIrTe
4
.
