2014年4月
Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
SCIENTIFIC REPORTS
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- 巻
- 4
- 号
- 開始ページ
- 4844
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/srep04844
- 出版者・発行元
- NATURE PUBLISHING GROUP
Current-induced spin polarization (CISP) on the outermost surfaces of Au, Cu, Pt, Pd, Ta, and W nanoscaled films were studied using a spin-polarized positron beam. The Au and Cu surfaces showed no significant CISP. In contrast, the Pt, Pd, Ta, and W films exhibited large CISP (3 similar to 15% per input charge current of 10(5) A/cm(2)) and the CISP of Ta and W were opposite to those of Pt and Pd. The sign of the CISP obeys the same rule in spin Hall effect suggesting that the spin-orbit coupling is mainly responsible for the CISP. The magnitude of the CISP is explained by the Rashba-Edelstein mechanism rather than the diffusive spin Hall effect. This settles a controversy, that which of these two mechanisms dominates the large CISP on metal surfaces.
- リンク情報
- ID情報
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- DOI : 10.1038/srep04844
- ISSN : 2045-2322
- Web of Science ID : WOS:000335132700001