垂直磁気記録方式におけるトラックエッジノイズの評価法

抄録

  A new method for measuring track edge noise in perpendicular magnetic recording is proposed. Extraction signals were initially recorded at both edges of a write track to reduce the stray field from background magnetization, which deforms the bias field of the read head. The extraction signals also made the track edge noise clear. The linear density of the extraction signal was optimized to produce a smaller stray field and transition noise. By using the proposed method, the source of the track edge noise was determined to be the erase band formed near the recorded track edges.