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A spin torque meter with magnetic facet domains
Kyoung-Woong Moon1, Changsoo Kim1, Jungbum Yoon1
1Spin Convergence Research Team, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea.
Nature Communications
|September 19, 2018
Summary
This study measures spin torques (STs) driving magnetic domain wall (DW) motion in spintronic devices. Simultaneous measurement distinguishes spin transfer and spin-Hall effect contributions to DW movement.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- Current-induced magnetic domain wall (DW) motion is fundamental to spintronic devices.
- Injected currents generate spin torques (STs) via spin transfer and the spin-Hall effect.
- Quantifying the contribution of each ST mechanism is crucial for device optimization.
Purpose of the Study:
- To simultaneously measure spin transfer and spin-Hall effect contributions to DW motion.
- To investigate the distinct mechanisms underlying each ST phenomenon.
- To utilize magnetic facet domains for precise torque characterization.
Main Methods:
- Development of a novel experimental setup using mountain-shaped magnetic facet domains with straight DWs.
- Application of opposing external magnetic fields and in-plane magnetic fields to modulate DW equilibrium angles.
- Analysis of DW angle variations to differentiate between spin transfer and spin-Hall effect torques.
Main Results:
- Successfully demonstrated simultaneous measurement of both spin transfer and spin-Hall effect STs.
- Observed distinct DW angle responses to applied fields, correlating with specific torque mechanisms.
- Established a method to decouple and quantify individual ST contributions.
Conclusions:
- The study provides a new method for simultaneously measuring different spin torques acting on magnetic domain walls.
- Understanding individual ST contributions is key to advancing spintronic device efficiency and functionality.
- The findings pave the way for more sophisticated spintronic device designs.
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