Journal
AIP ADVANCES
Volume 11, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0035845
Keywords
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Funding
- Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) [15H05699]
- JSPS Core-to-Core program [JPJSCCA20160005]
- Center for Science and Innovation in Spintronics (CSIS), Tohoku University
- Graduate Program in Spintronics at Tohoku University
- Grants-in-Aid for Scientific Research [15H05699] Funding Source: KAKEN
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The study quantitatively investigates the current-induced spin-orbit torque in single-layer ferromagnetic CoFeB thin films using in-plane harmonic Hall measurements. The results show that the damping-like (DL) and field-like (FL) torques exhibit opposite trends of ferromagnetic layer thickness dependence before saturation, suggesting different spin torque efficiencies. The findings provide strong evidence that the DL torque originates from a spin-Hall-like charge-spin conversion, while the FL torque stems from interfacial effects like the Rashba-Edelstein effect.
The current-induced spin-orbit torque in single-layer ferromagnetic CoFeB thin films is quantitatively investigated by using in-plane harmonic Hall measurements. After the subtraction of thermal contributions such as the anomalous and ordinary Nernst effects, the obtained overall spin-orbit torque is successfully decomposed into damping-like (DL) and field-like (FL) terms. The DL and FL torques exhibit opposite trends of ferromagnetic layer thickness dependence before saturation, giving rise to distinctively different spin torque efficiencies: the DL torque efficiency shows a strong thickness dependence, while the FL torque efficiency is almost independent of the thickness. Such a result shows strong evidence that the DL torque originates from a spin-Hall-like charge-spin conversion in the ferromagnet, while the FL torque stems from interfacial effects such as the Rashba-Edelstein effect. With both DL and FL torques quantified in the single-layer CoFeB, our results exhibit an important step toward the understanding of nontrivial spin-orbit torques in single-layer ferromagnetic thin films.
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