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 journalArticlepeer-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 languageEnglish
Pages (from-to)139-143
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume342
DOIs
Publication statusPublished - 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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