Writing and detecting bits at 100 Gbit/in(2) in longitudinal magnetic recording media

We have written bits in longitudinal media at extremely high areal densitie s, >100, using a focused ion beam (FIB) trimmed write head mounted on a sta tic write/read tester. Bits were written at a track pitch of similar to 100 nm and with a 62.5 transition spacing with the same trimmed write head. Th e bits were characterized with the head read sensor and also with magnetic force microscopy (MFM). The MFM images were analyzed with respect to transi tion position jitter, signal-to-noise, and track width.