Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (1): 8-12.DOI: 10.11890/1006-7191-101-8

• 研究论文 • 上一篇    下一篇

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

杨波1;秦高梧1;裴文利1;任玉平1;肖娜1;赵骧2;K. Oikawa3   

  1. 1. 东北大学
    2. 东北大学材料各向异性和织构教育部重点实验室
    3.
  • 收稿日期:2009-02-06 修回日期:2009-03-07 出版日期:2010-02-25 发布日期:2010-02-09
  • 通讯作者: 秦高梧

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

Bo YANG, Gaowu QIN, Weili PEI, Yuping REN, Na XIAO and Xiang ZHAO,Katsunari OIKAWA   

  1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University,Shenyang 110004, China
  • Received:2009-02-06 Revised:2009-03-07 Online:2010-02-25 Published:2010-02-09
  • Contact: Gaowu QIN

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摘要：

A series of hexagonal close-packed (HCP) Co-W thin films were deposited by sputtering on surface oxidized silicon substrates at 300℃. A linear dependency of saturation magnetization (Ms) on W content was found up to about 9 at.%W, and then it underwent an increased Ms vs. W content curve whereafter 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 ~ 17 at.%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.

Abstract:

A series of hexagonal close-packed (HCP) Co-W thin films were deposited by sputtering on surface oxidized silicon substrates at 300℃. 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 13at.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.

Key words: Magnetic recording media, Phase separation, Thin film, Thermal magnetization