Degree of chemical reaction of carbon and oxygen to ferromagnetic grains for Co-based alloy-oxide granular structure

Shingo Sasaki, Shin Saito, Migaku Takahashi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The saturation magnetization factor, Ms, was investigated for a Co-based alloy-oxide granular film through the quantitative analysis of film composition and phase formation. Using a carbon cap layer deposited directly onto the Co-SiO2 film, both oxidation and carbonization of cobalt caused a reduction in Ms. The composition of the granular film strongly affects Ms, because the Ar gas pressure and discharge power during Co-SiO2 sputtering alters the Co and oxygen content in the film. In particular, for a film fabricated under a high Ar gas pressure such as 8.0 Pa, Ms was significantly decreased, due to the formation of the antiferromagnetic CoO phase.

Original languageEnglish
Pages (from-to)3023-3026
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume320
Issue number22
DOIs
Publication statusPublished - 2008 Nov 1

Keywords

  • Co-carbide
  • Co-oxide granular film
  • Oxidation
  • Saturation magnetization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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