Abstract
We investigated the effects of post-annealing on the magnetic properties and spin orbit torque (SOT) in CoPt/YPtBi heterostructures, where YPtBi is a topological semimetal with a large spin Hall angle. From crystal structure analysis by X-ray diffraction and transmission electron microscopy, magnetization, anomalous Hall resistance, and second harmonic Hall measurements, we found that the magnetic properties and SOT performance in CoPt/YPtBi are improved by post-growth annealing up to 300 °C, while they are degraded after 350 °C annealing due to intermixing and alloying. By comparative experiments using CoPt/W, we show that YPtBi is more resistive to intermixing and alloying with CoPt than W.
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