Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam

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 (3~15% per input charge...

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Autores principales: Zhang, H. J., Yamamoto, S., Fukaya, Y., Maekawa, M., Li, H., Kawasuso, A., Seki, T., Saitoh, E., Takanashi, K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003475/
https://www.ncbi.nlm.nih.gov/pubmed/24776781
http://dx.doi.org/10.1038/srep04844
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author Zhang, H. J.
Yamamoto, S.
Fukaya, Y.
Maekawa, M.
Li, H.
Kawasuso, A.
Seki, T.
Saitoh, E.
Takanashi, K.
author_facet Zhang, H. J.
Yamamoto, S.
Fukaya, Y.
Maekawa, M.
Li, H.
Kawasuso, A.
Seki, T.
Saitoh, E.
Takanashi, K.
author_sort Zhang, H. J.
collection PubMed
description 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 (3~15% 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.
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spelling pubmed-40034752014-04-30 Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam Zhang, H. J. Yamamoto, S. Fukaya, Y. Maekawa, M. Li, H. Kawasuso, A. Seki, T. Saitoh, E. Takanashi, K. Sci Rep Article 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 (3~15% 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. Nature Publishing Group 2014-04-29 /pmc/articles/PMC4003475/ /pubmed/24776781 http://dx.doi.org/10.1038/srep04844 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/3.0/ This work is licensed under a Creative Commons Attribution 3.0 Unported License. The images in this article are included in the article's Creative Commons license, unless indicated otherwise in the image credit; if the image is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the image. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/
spellingShingle Article
Zhang, H. J.
Yamamoto, S.
Fukaya, Y.
Maekawa, M.
Li, H.
Kawasuso, A.
Seki, T.
Saitoh, E.
Takanashi, K.
Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
title Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
title_full Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
title_fullStr Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
title_full_unstemmed Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
title_short Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
title_sort current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003475/
https://www.ncbi.nlm.nih.gov/pubmed/24776781
http://dx.doi.org/10.1038/srep04844
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