Author(s): Zhang, EZ (Zhang, Enze); Deng, YC (Deng, Yongcheng); Li, WH (Li, Weihao); Liu, XH (Liu, Xionghua); Wang, KY (Wang, Kaiyou)

Source: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE Article Number: 2200498 DOI: 10.1002/pssa.202200498 Early Access Date: AUG 2022

Abstract: Spin-orbit torque (SOT) efficiencies are systematically investigated in [Pt (t(Pt))/Ru (1-t(Pt))](10)/Pt (0.8 nm)/Co multilayer systems with perpendicular magnetic anisotropy and in-plane magnetic anisotropy. A high SOT efficiency is achieved by the optimized Pt-based multilayer structures. The maximum damping-like efficiency xi(DL) of 0.31 is found in [Pt (t(Pt))/Ru (1-t(Pt))](10)/Pt (0.8 nm)/Co multilayers with relatively low resistivity (58.8 mu omega cm), which is three times larger than that of pure Pt layer and is also significantly larger than the PtnRu1-n alloy with the same composition. Considering the interface transparency, intrinsic spin Hall ratio theta(SH) of around 0.7, being close to the upper limit 0.8 for Pt-based heavy metals, is obtained. The strongly enhanced xi(DL) is attributed to the high spin Hall conductivity contributed by the intrinsic spin Hall contribution and the enhanced resistivity due to enhanced interfacial scattering. This work provides a good balance of SOT efficiency and resistivity through the optimized Pt-based multilayer structure, which is expected to be applicable in beyond Pt-based systems and has great potential in building energy-efficient SOT devices in the future.

Accession Number: WOS:000844808800001

ISSN: 1862-6300

eISSN: 1862-6319

Full Text: https://onlinelibrary.wiley.com/doi/10.1002/pssa.202200498