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

作　　者：Bo YANG Gaowu QIN Weili PEI Yuping REN Na XIAO Xiang ZHAO Katsunari OIKAWA 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China [2]Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

出　　处：《Acta Metallurgica Sinica(English Letters)》2010年第1期8-12,共5页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No50671020);Ministry of Education of China (No108039)

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. 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 ino creased 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.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 ino creased 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.

关 键 词：Magnetic recording media Phase separation Thin film Thermal magnetization 

分 类 号：O632.31[理学—高分子化学] TM277[理学—化学]