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Title: Ta Doping Effect in Co60C40 Thin Films
Authors: Zhao, Y.
Zhou, T.J.
Wang, J.P.
Chong, T.C. 
Keywords: Carbon
Magnetic recording media
Phase segregation
Ta doping
Issue Date: Sep-2003
Citation: Zhao, Y., Zhou, T.J., Wang, J.P., Chong, T.C. (2003-09). Ta Doping Effect in Co60C40 Thin Films. IEEE Transactions on Magnetics 39 (5 II) : 2702-2704. ScholarBank@NUS Repository.
Abstract: (Co60C40)1-x Tax films (0% ≤ x ≤ -10%) with thickness of 30 nm were cosputtered onto C-buffered glass substrates at room temperature. The as-deposited films are structurally amorphous and nonferromagnetic. The annealed films (400 ° for 30 min) become magnetically hard with Hc ranging from 480 to 780 Oe and Ms changing from 480 to 600 emu/cm3. Both Hc and Ms increase with Ta concentration as x < 3%, show peaks at x = 3%, and then decrease with Ta concentration. This is because a small amount of Ta doping might enhance the diffusion of carbon in the films and thus form more cobalt grains upon annealing. However, doping more Ta (x > 3%) destroys the Co structure and this causes the drop in both Hc and Ms. After annealing at 300 °, Hc of (Co60C 40)97Ta3 films increases from 0 to about 380 Oe, while almost no changes are observed for Co60 C40 films. Doping in a Co-C system with a larger atom such as Ta may be a way to enhance the segregation of Co and C and, therefore, reduce phase segregation temperature.
Source Title: IEEE Transactions on Magnetics
ISSN: 00189464
DOI: 10.1109/TMAG.2003.815568
Appears in Collections:Staff Publications

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