Interface structure of half-metallic Heusler alloy Co2 MnSi thin films facing an MgO tunnel barrier determined by x-ray magnetic circular dichroism

Toshiaki Saito, Toshikazu Katayama, Takayuki Ishikawa, Masafumi Yamamoto, Daisuke Asakura, Tsuneharu Koide, Yoshio Miura, Masafumi Shirai

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Using x-ray absorption spectroscopy and x-ray magnetic circular dichroism, we performed an element-specific investigation of the spin magnetic moments (mspin) of Mn and Co of Co2 MnSi ultrathin layers grown on an Fe underlayer to stabilize the ferromagnetism and facing an MgO barrier. The experimentally observed dependence of the mspin values of Co and Mn on the Co2 MnSi layer thickness in the ultrathin region is qualitatively in good agreement with the one theoretically obtained for a MnSi-terminated interface of the Co2 MnSi layer facing an MgO barrier. This clarification would provide a strong basis for further advancement of applications of half-metallic Heusler alloy electrodes into spintronic devices.

Original languageEnglish
Article number144417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number14
DOIs
Publication statusPublished - 2010 Apr 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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