高記録分解能Co-Cr-Ta二層膜ハードディスク媒体の作製

抄録

In order to improve the anisotropy field distribution of Co-Cr layer, the effect of Ta addition into a Co-Cr recording layer was investigated. It was found that by the Ta addition, the initial Co-Cr layer with poor crystalline orientation was eliminated, and the crystalline orientation and the crystallinity were drastically improved. It was also confirmed that the anisotropy field distribution of the Co-Cr-Ta layer was narrowed to one-third of the Co-Cr layer. To clarify the effect of Ta addition on recording characteristics, Co-Cr-Ta/Nb-Permalloy double-layer media were prepared and their recording characteristics were measured. The Co-Cr-Ta media showed a sharp magnetization distribution and higher reproduced voltage at high densities than did the Co-Cr media.