High Resolution Hard-Disk Media for Perpendicular Magnetic Recording

While the main pole of single-pole type heads must be kept thin to improve the high linear density response in perpendicular magnetic recording, the magnetic interaction between the main pole and the backing layer of the double-layered media is weakened as a result. The experimental results of this study show that double-layered media with a thin Co-Cr recording layer intensifies the magnetic interaction, so that the linear density response is improved. In addition, ferrite-substrate disks were investigated for possible use in high-frequency applications, as a means of achieving high linear densities and high data rate recording.