To realize a recording density of over 50 Gb/in~2, a quarter-micron-track-width perpendicular head consisting of an SPT writer and an advanced GMR reader was developed. A low-noise and thermally stable double-layered medium and a signal processing technique suitable for perpendicular recording channel were also developed. From the results of this study, the potential of perpendicular recording for realizing 52.5 Gb/in~2 was clarified. At the same time, high frequency write characteristics at around 60 MB/s as well as the acceptable thermal stability characteristics were also confirmed.
展开▼
