Abnormal saturation magnetization dependency on W content for Co-W thin films

Bo Yang, Gaowu Qin, Weili Pei, Yuping Ren, Na Xiao, Xiang Zhao, Katsunari Oikawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A series of hexagonal close-packed (HCP) Co-W thin films were deposited by sputtering on surface oxidized silicon substrates at 300 °C. A linear dependency of saturation magnetization (Ms) on W content was found up to about 9 at. pct W, and then it underwent an increased Ms vs: W content curve as compared to the initial linear dependency. The thermal magnetization technique was used to confirm that the increased Ms behaviour is correlated to the phase separation of the Co-W thin films. The phase separation behaviour was also found to be dependent on W content and the reason was discussed in detail. Finally an interesting composition range was suggested to be about 13 at. pct-17 at. pct W for the Co-W thin films, in which they exhibit much higher magnetic anisotropy energy than Co-Cr thin films and improved phase separation.

Original languageEnglish
Pages (from-to)8-12
Number of pages5
JournalActa Metallurgica Sinica (English Letters)
Volume23
Issue number1
Publication statusPublished - 2010 Dec 17

Keywords

  • Magnetic recording media
  • Phase separation
  • Thermal magnetization
  • Thin film

ASJC Scopus subject areas

  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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