Abstract
High density magnetic recording is investigated for a combination of single-layered perpendicular media and ring-type heads. Medium magnetic properties (Hc and Mr/Ms) are improved by introducing a dual underlayer structure. Read/write experiments show that the linear recording resolution (D/sub 50/) increases drastically with decreasing magnetic spacing. D/sub 50/ values of 190-220 kFCI are observed using a flying MR head at an estimated magnetic spacing of 40 nm. Using contact recording, even higher resolution of D/sub 50/*=300 kFCI is confirmed. Side-writing and side-erasing can be reduced below 0.2 /spl mu/m by employing a narrow gap write head with trimmed sharp track edge, which demonstrates the possibility of track density greater than 25 kTPI. The recording areal density can be increased to the 10 Gb/in/sup 2/ level with the present recording system.
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