Enhancement of spin current generation in epitaxial α-Ta/CoFeB bilayer

Hiromu Gamou, Ye Du, Makoto Kohda, Junsaku Nitta

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22 Citations (Scopus)


We report the enhancement of the spin Hall effect in a (111)-oriented epitaxial α-Ta/CoFeB bilayer system, which was previously believed to show the small spin Hall angle (SHA). The SHA of the epitaxial α-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 α-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 α-Ta is due to the extrinsic contribution to the SHA.

Original languageEnglish
Article number184408
JournalPhysical Review B
Issue number18
Publication statusPublished - 2019 May 9


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