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Title: Reversible strain-induced spin-orbit torque on flexible substrate
Authors: Wong, Grayson Dao Hwee
Ang, Calvin Ching Ian
Gan, Weiliang
Law, Wai Cheung
Xu, Zhan
Xu, Feng
Seet, Chim Seng
Lew, Wen Siang
Keywords: Science::Physics
Issue Date: 2021
Source: Wong, G. D. H., Ang, C. C. I., Gan, W., Law, W. C., Xu, Z., Xu, F., Seet, C. S. & Lew, W. S. (2021). Reversible strain-induced spin-orbit torque on flexible substrate. Applied Physics Letters, 119(4), 042402-.
Project: NRF2015-IIP001-001
Journal: Applied Physics Letters
Abstract: We propose the use of mechanical strain and mild annealing to achieve reversible modulation of spin-orbit torque (SOT) and Gilbert damping parameter. X-ray diffraction results show that the residual spin-orbit torque enhancement and Gilbert damping reduction, due to the post-mechanical strain treatment, can be reset using mild annealing to alleviate the internal strain. The spin Hall efficiency of the heat- and strain-treated Pt/Co bilayer was characterized through spin-torque ferromagnetic resonance, and it was found that the device could switch between the strain enhanced SOT and the pristine state. The Gilbert damping parameter behaves inversely with the spin Hall efficiency, and therefore, strain can be used to easily tune the device switching current density by a factor of ∼2 from its pristine state. Furthermore, the resonance frequency of the Pt/Co bilayer could be tuned using purely mechanical strain, and from the endurance test, the Pt/Co device can be reversibly manipulated over 104 cycles demonstrating its robustness as a flexible device.
ISSN: 0003-6951
DOI: 10.1063/5.0056995
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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