Track Edge Noise Characteristics in Low Noise Longitudinal and Perpendicular Media

Abstract

In this paper, we discuss the track-edge noise characteristics in perpendicular media in comparison to longitudinal media. The composition of the magnetic layer was the same in each medium. We found that the track-edge recording characteristics of perpendicular media were very different from those of longitudinal media. Cross-track profiles of normalized medium noise in perpendicular media, considered as a whole, is higher than in longitudinal media. In longitudinal media, distinct track-edge noise was observed, but in perpendicular media, the track-edge noise level is lower than on-track noise. The reason for the low track-edge noise characteristics in perpendicular media is due to a suppressed demagnetize field around the track edge, which results in a sharp track-edge shape. Furthermore, the side-erasure width in perpendicular media is narrower than that in longitudinal media, and is less dependent of the yaw-angle.