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Title: Strain-mediated spin-orbit torque enhancement in Pt/Co on flexible substrate
Authors: Wong, Grayson Dao Hwee
Xu, Zhan
Gan, Weiliang
Ang, Calvin Ching Ian
Law, Wai Cheung
Tang, Jiaxuan
Zhang, Wen
Wong, Ping Kwan Johnny
Yu, Xiaojiang
Xu, Feng
Wee, Andrew T. S.
Seet, Chim Seng
Lew, Wen Siang
Keywords: Science::Physics
Issue Date: 2021
Source: Wong, G. D. H., Xu, Z., Gan, W., Ang, C. C. I., Law, W. C., Tang, J., Zhang, W., Wong, P. K. J., Yu, X., Xu, F., Wee, A. T. S., Seet, C. S. & Lew, W. S. (2021). Strain-mediated spin-orbit torque enhancement in Pt/Co on flexible substrate. ACS Nano, 15(5), 8319-8327.
Project: NRF2015-IIP001-001
RCA − 17/284
Journal: ACS Nano
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.
ISSN: 1936-0851
DOI: 10.1021/acsnano.0c09404
Schools: School of Physical and Mathematical Sciences 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © 2021 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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