29.5- $\hbox{Gb/in}^{2}$ Recording Areal Density on Barium Ferrite Tape

摘要: The recording performance of a new magnetic tape based on perpendicularly oriented barium ferrite particles was investigated using 90-nm-wide giant-magnetoresistive reader and prototype enhanced-field write head. A linear density 600 kb/in with postdetection byte-error rate $ demonstrated measured data software read channel that used noise-predictive maximum likelihood detection scheme. Using iterative decoding architecture, user bit-error can be achieved at this operating point. To facilitate aggressive scaling the track density, we made several advances in area track-following servo. First, developed an experimental low-noise transport. Second, implemented optimized servo together timing-based pattern enables generation position estimates nanoscale resolution high update rate. Third, field-programmable gate array-based prototyping platform which have $H_{\infty }$ -based controller, enabling real-time closed-loop experiments. Combining these technologies, position-error signal (PES) standard deviation 10.3 nm. This magnitude PES combination allows writing reading 177-nm-wide tracks kb/in, for equivalent areal 85.9 Gb/in $^{2}$ . paper clearly demonstrates continued potential technologies low-cost particulate media.