Field-Free Spin-Orbit Torque Switching of Canted van der Waals Magnets.
basic_science · Level V
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- Record sourced from PubMed, PMID 40162919.
- Also identified by DOI 10.1021/acsnano.4c16826 and PMC identifier 12004925.
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Abstract
Spin-orbit torque (SOT) magnetization switching is crucial for next-generation energy-efficient spintronic technologies. The recent discovery of van der Waals (vdW) magnets holds promise for such SOT phenomena because of their tunable magnetic properties. However, a demonstration of energy-efficient and field-free SOT switching of vdW magnets is required for their potential applications. Here, we demonstrate field-free and deterministic switching using an intrinsic canted vdW magnet Fe<sub>5</sub>GeTe<sub>2</sub> in a heterostructure with Pt having a larger spin Hall conductivity up to room temperature. Using anomalous Hall electrical detection for magnetization readout, we reveal that field-free deterministic SOT switching in the Fe<sub>5</sub>GeTe<sub>2</sub>/Pt Hall devices can be attributed to the canted magnetic anisotropy of Fe<sub>5</sub>GeTe<sub>2</sub>, originating from its crystal and magnetic structures. Detailed second harmonic Hall measurements exhibit a high spin Hall conductivity σ<i><sub>SH</sub></i> ∼ 3 × 10<sup>5</sup>ℏ/2<i>e</i> Ω<sup>-1</sup>m<sup>-1</sup> with an SOT effective damping-like field of 0.06 mT per MA/cm<sup>2</sup>. These findings reveal efficient and field-free SOT phenomena in the canted vdW magnet Fe<sub>5</sub>GeTe<sub>2</sub> up to room temperature and highlight their usefulness in spintronic devices.