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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Strain-Mediated Spin-Orbit Torque Enhancement in Pt/Co on Flexible Substrate
Grayson Dao Hwee Wong1,2, Zhan Xu1,3, Weiliang Gan1
1School of Physical & Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.
ACS Nano
|May 10, 2021
Summary
Mechanical strain enhances spin Hall efficiency in platinum/cobalt bilayers, a key factor for energy-efficient spintronic devices. The effect originates from a bulk property in platinum and persists even after strain removal.
Area of Science:
- Spintronics
- Materials Science
- Condensed Matter Physics
Background:
- Spin-orbit torque in heavy metals enables energy-efficient spintronic devices.
- Spin Hall efficiency is crucial for spin current generation.
- Mechanical strain has shown potential to enhance spin Hall efficiency, but the underlying mechanisms are not well understood.
Purpose of the Study:
- To investigate the origin of enhanced spin Hall efficiency in platinum/cobalt (Pt/Co) bilayers under mechanical strain.
- To quantify the strain-induced enhancement and its persistence after strain removal.
Main Methods:
- Fabrication of Pt/Co bilayers.
- Application of mechanical strain.
- Measurement of spin Hall efficiency.
- Spin transparency measurements.
- X-ray magnetic circular dichroism (XMCD) analysis.
- Resistivity measurements.
Main Results:
- A 45% increase in spin Hall efficiency was observed in Pt/Co bilayers.
- 78% of the enhancement remained even after the mechanical strain was removed.
- Analysis indicated the enhancement stemmed from a bulk effect within the platinum layer.
- A linear correlation between spin Hall efficiency and resistivity suggested increased skew-scattering.
Conclusions:
- The study elucidates the origin of strain-induced enhancement of spin Hall efficiency as a bulk effect in platinum.
- The persistent nature of the enhancement offers potential for robust, energy-efficient spintronic device applications.
- Findings pave the way for utilizing mechanical strain to optimize spintronic device performance.
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