Waveform Analysis of Isolated Pulses for Perpendicular Recording Media.

Waveform of isolated pulses for single-layer perpendicular media written with a ring head was analyzed. In particular, the dependence of the peak separation and amplitude for dipulse waveforms at 2 kFRPI on the write current was investigated. Writing with a small-gap-length head at small spacing makes the magnetization transition narrower. It was easy to realize saturation recording for a medium with a steep hysteresis loop. A Co-Cr-Nb-Pt single layer medium with a soft magnetic back layer has the possibility of high-resolution recording with large output. The medium seems to become one of candidate media for a 20 Gbit/in2 area density recording.