Giant Enhancements of Perpendicular Magnetic Anisotropy and Spin-Orbit Torque by a MoS<sub>2</sub> Layer.
basic_science · Level V
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- Record sourced from PubMed, PMID 30957913.
- Also identified by DOI 10.1002/adma.201900776.
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Abstract
2D transition metal dichalcogenides have attracted much attention in the field of spintronics due to their rich spin-dependent properties. The promise of highly compact and low-energy-consumption spin-orbit torque (SOT) devices motivates the search for structures and materials that can satisfy the requirements of giant perpendicular magnetic anisotropy (PMA) and large SOT simultaneously in SOT-based magnetic memory. Here, it is demonstrated that PMA and SOT in a heavy metal/transition metal ferromagnet structure, Pt/[Co/Ni]<sub>2</sub> , can be greatly enhanced by introducing a molybdenum disulfide (MoS<sub>2</sub> ) underlayer. According to first-principles calculation and X-ray absorption spectroscopy (XAS), the enhancement of the PMA is ascribed to the modification of the orbital hybridization at the interface of Pt/Co due to MoS<sub>2</sub> . The enhancement of SOT by the role played by MoS<sub>2</sub> is explained, which is strongly supported by the identical behavior of SOT and PMA as a function of Pt thickness. This work provides new possibilities to integrate 2D materials into promising spintronics devices.