Current-induced spin polarization on a Pt surface: A new approach using spin-polarized positron annihilation spectroscopy

A. Kawasuso; Y. Fukaya; M. Maekawa; H. Zhang; T. Seki; T. Yoshino; E. Saitoh; K. Takanashi

doi:10.1016/j.jmmm.2013.04.006

Current-induced spin polarization on a Pt surface: A new approach using spin-polarized positron annihilation spectroscopy

A. Kawasuso, Y. Fukaya, M. Maekawa, H. Zhang, T. Seki, T. Yoshino, E. Saitoh, K. Takanashi

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 001 (1%).

Original language	English
Pages (from-to)	139-143
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	342
DOIs	https://doi.org/10.1016/j.jmmm.2013.04.006
Publication status	Published - 2013

Keywords

Positron annihilation
Positronium
Surface magnetism
Surface spin accumulation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{ea613fe0ceb04dd38446ca276067b27f,

title = "Current-induced spin polarization on a Pt surface: A new approach using spin-polarized positron annihilation spectroscopy",

abstract = "Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 001 (1%).",

keywords = "Positron annihilation, Positronium, Surface magnetism, Surface spin accumulation",

author = "A. Kawasuso and Y. Fukaya and M. Maekawa and H. Zhang and T. Seki and T. Yoshino and E. Saitoh and K. Takanashi",

note = "Funding Information: We thank S. Maekawa and J. Ieda of the Japan Atomic Energy Agency for their valuable comments. This work was supported by the JSPS KAKENHI Grant no. 24310072 .",

year = "2013",

doi = "10.1016/j.jmmm.2013.04.006",

language = "English",

volume = "342",

pages = "139--143",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

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TY - JOUR

T1 - Current-induced spin polarization on a Pt surface

T2 - A new approach using spin-polarized positron annihilation spectroscopy

AU - Kawasuso, A.

AU - Fukaya, Y.

AU - Maekawa, M.

AU - Zhang, H.

AU - Seki, T.

AU - Yoshino, T.

AU - Saitoh, E.

AU - Takanashi, K.

N1 - Funding Information: We thank S. Maekawa and J. Ieda of the Japan Atomic Energy Agency for their valuable comments. This work was supported by the JSPS KAKENHI Grant no. 24310072 .

PY - 2013

Y1 - 2013

N2 - Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 001 (1%).

AB - Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 001 (1%).

KW - Positron annihilation

KW - Positronium

KW - Surface magnetism

KW - Surface spin accumulation

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U2 - 10.1016/j.jmmm.2013.04.006

DO - 10.1016/j.jmmm.2013.04.006

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VL - 342

SP - 139

EP - 143

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

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