Abstract
The recording performances of Co-Cr-Nb and Co-Cr-Ta perpendicular media were studied along with their noise properties. Single-layer media were recorded by using a ring head. The Co-Cr-Nb and the Co-Cr-Ta media exhibited a similar high-density response, showing a maximum reproducible density of 720 kFRPI. It was found that the noise level for Co-Cr-Nb media was lower than that for Co-Cr-Ta media by a factor of 5 dB. MFM images of recorded medium surfaces are much clearer and more homogeneous for a Co-Cr-Nb medium than those for a Co-Cr-Ta medium, corrersponding to the noise properties.
