Simulation Study of Effect of Dispersions on Recording Performances in Perpendicular Magnetic Recording Media

Naoki HONDA  Kazuhiro OUCHI  

IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.8   pp.1577-1582
Publication Date: 2007/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.8.1577
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress of High-Density Information Storage)
perpendicular magnetic recording,  simulation,  effect of dispersions,  stacked media,  

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Effect of dispersions of medium parameters and structure on the recording performance was systematically investigated. Moderately increased M-H loop slope is effective for obtaining higher thermal stability, smaller saturation fields, and higher resolution. It was found that the most influential factor is the dispersion in anisotropy field, Hk. Small Hk dispersion reduced the noise when exchange coupled media were used. Reduced grain size and a stacked structure of the media were expected to give a restricted gain in the signal to noise ratio.