READ/WRITE CHARACTERISTICS OF Co-DOPED FERRITE DISK

抄録

  We investigated the read/write characteristics of Co-doped ferrite disks. We found that the overwrite characteristics strongly depended on the coercive squareness of Co-doped media. Overwrite characteristics were able to be improved to better than -30 dB when S^∗ was controlled. The track edge noise of the Co-doped ferrite media written by a conventional narrow gap head was small, as was the on-track noise, and it was independent of recording density. The NLTS (Non-Linear Transition Shift) value for the Co-doped ferrite media at 200 kFRPI is half that for metal medium. The erase band width in the Co-doped media was as narrow as that in metal media. Co-doped ferrite media exhibited excellent low noise characteristics in high recording density.