Field-Free Spin-Orbit Torque Switching of Canted van der Waals Magnets

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 Fe5GeTe2 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 Fe5GeTe2/Pt Hall devices can be attributed to the canted magnetic anisotropy of Fe5GeTe2, originating from its crystal and magnetic structures. Detailed second harmonic Hall measurements exhibit a high spin Hall conductivity σSH ∼ 3 × 105ℏ/2e Ω-1m-1 with an SOT effective damping-like field of 0.06 mT per MA/cm2. These findings reveal efficient and field-free SOT phenomena in the canted vdW magnet Fe5GeTe2 up to room temperature and highlight their usefulness in spintronic devices.