Neighborhood induced reader bias shift in perpendicular recording

TitleNeighborhood induced reader bias shift in perpendicular recording
Publication TypeJournal Article
Year of Publication2003
AuthorsDhagat, P., D. Palmer, and B. Xu
JournalJournal of Applied Physics
Pagination7729 - 7731
Date Published05/2003
Keywordscompensation, harmonic distortion, magnetic recording noise, magnetisation, perpendicular magnetic recording

A spin-stand technique to determine the influence of the neighborhood on readback in perpendicular recording is presented. A square wave was recorded on an ac erased medium. Stray fields from neighboring tracks resulted in reader bias shift and thereby second-harmonic distortion in the spectrum of the square wave. An external perpendicular field applied to compensate the distortion provided a measure of the neighborhood effect on readback. A dc magnetized track written approximately a track width away was found to change the required compensating field by 5 Oe. Additional dc tracks further enhanced or diminished the compensating field depending on their relative magnetization direction. The immediate neighborhood was proven to have a dominating influence on the reader bias.

Short TitleJ. Appl. Phys.