Journal
PHYSICAL REVIEW B
Volume 99, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.184408
Keywords
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Funding
- Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) [15H05699, 15H02099, 15H05854, 25220604]
- EPSRC-JSPS Core-to-Core program
- Graduate Program in Spintronics at Tohoku University
- [18J11981]
- Grants-in-Aid for Scientific Research [15H02099] Funding Source: KAKEN
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We report the enhancement of the spin Hall effect in a (111)-oriented epitaxial alpha-Ta/CoFeB bilayer system, which was previously believed to show the small spin Hall angle (SHA). The SHA of the epitaxial alpha-Ta/CoFeB structure estimated by spin Hall magnetoresistance measurement is 0.15, a value that is 1.5 times larger than the conventional amorphous-Ta/CoFeB structure. Effective SHA estimated by harmonic Hall measurement qualitatively supports the SMR result, whereas the strength of the field-like field of epitaxial alpha-Ta samples is similar to that of amorphous Ta samples. According to the resistivity dependence on the SHA, the origin of the enhanced SHA in epitaxial alpha-Ta is due to the extrinsic contribution to the SHA.
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