Cross-track noise profile measurement for adjacent-track interference study and write-current optimization in perpendicular recording

A cross-track noise profile measurement was developed for identifying the source of adjacent-track interference (ATI) fields in perpendicular recording media. The noise amplitude as a function of cross-track position and write current delineates the extent, magnitude, and polarity of stray fields under different portions of the head. The polarity of the stray field is identifies with appropriate on-track and off-track erase conditions.