Amorphous C and Si films were sputter-deposited as underlayers of Co/Pd multilayer perpendicular magnetic recording media. The magnetic properties of the media were significantly affected by the underlayer thickness; namely, the values of coercivity Hc and nucleation field -Hn increased and the value of α decreased with merely increasing the thickness of C or Si underlayer, where α is the derivative of M-H loop at the value of coercivity. The coercivity was not always affected by magnetic anisotropy constant Ku for the Co/Pd media. In read-write experiments, the higher S/N ratio was obtained for the media with the thicker C or Si underlayer, which exhibited low α and high Hc. In the time decay experiments of magnetization, the Co/Pd multilayer media with C or Si underlayer possessed good thermal stability. This study demonstrated that the introduction of C or Si underlayer greatly improves magnetic properties, read-write characteristics, and thermal stability of Co/Pd multilayer perpendicular magnetic recording media.
|Journal of Magnetism and Magnetic Materials
|Published - 2001 10月
|Proceedings of the 5th Perpendicular Magnetic Recording Conference (PMRC 2000) - Sendai, Japan
継続期間: 2000 10月 23 → 2000 10月 26
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