Magnetization-induced optical second harmonic generation from the surface of Co-doped rutile TiO2(110)

R. Watanabe, M. Yuasa, Y. Yahata, G. Mizutani, T. Suzuki, Y. Segawa, Y. Matsumoto, Y. Yamamoto, H. Koinuma

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We have investigated the surface magnetism of 5 at% Co-doped rutile TiO2(110) using magnetization-induced optical second harmonic generation (MSHG) in the longitudinal Kerr configuration with the incident beam angle of 4°. MSHG is observed at both 2hℏω = 2.33 eV and 2hℏω = 4.20 eV. MSH intensity showed a hysteresis as a function of the external magnetic field for the second harmonic photon energy of 2ℏω = 4.20 eV at which the absorption length limits the MSHG origin to the surface layer of 10 nm due to the TiO2 bulk. Since 5 at% Co: TiO2(110) is judged to have no metallic Co near the top surface by XPS, the hysteresis is attributed to a carrier-induced ferromagnetism at the surface of this material.

Original languageEnglish
Pages (from-to)1692-1695
Number of pages4
JournalSurface and Interface Analysis
Volume40
Issue number13
DOIs
Publication statusPublished - 2008 Dec 1
Externally publishedYes

Keywords

  • Co/rutile TiO
  • Dilute magnetic semiconductors
  • Hysteresis
  • Magnetization-induced optical second harmonic generation (MSHG)
  • Surface magnetization

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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  • Cite this

    Watanabe, R., Yuasa, M., Yahata, Y., Mizutani, G., Suzuki, T., Segawa, Y., Matsumoto, Y., Yamamoto, Y., & Koinuma, H. (2008). Magnetization-induced optical second harmonic generation from the surface of Co-doped rutile TiO2(110). Surface and Interface Analysis, 40(13), 1692-1695. https://doi.org/10.1002/sia.2907