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  • Title: Strain-Mediated Spin-Orbit Torque Enhancement in Pt/Co on Flexible Substrate.
    Author: Hwee Wong GD, Xu Z, Gan W, Ang CCI, Law WC, Tang J, Zhang W, Wong PKJ, Yu X, Xu F, Wee ATS, Seet CS, Lew WS.
    Journal: ACS Nano; 2021 May 25; 15(5):8319-8327. PubMed ID: 33970603.
    Abstract:
    Current-induced magnetization switching by spin-orbit torque generated in heavy metals offers an enticing realm for energy-efficient memory and logic devices. The spin Hall efficiency is a key parameter in describing the generation of spin current. Recent findings have reported enhancement of spin Hall efficiency by mechanical strain, but its origin remains elusive. Here, we demonstrate a 45% increase in spin Hall efficiency in the platinum/cobalt (Pt/Co) bilayer, of which 78% of the enhancement was preserved even after the strain was removed. Spin transparency and X-ray magnetic circular dichroism revealed that the enhancement was attributed to a bulk effect in the Pt layer. This was further confirmed by the linear relationship between the spin Hall efficiency and resistivity, which indicates an increase in skew-scattering. These findings shed light on the origin of enhancement and are promising in shaping future utilization of mechanical strain for energy-efficient devices.
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