Effect of Applied Magnetic Field Angle and Intensity on Magnetic Cluster State of Stacked Perpendicular Recording Media

Shohei SATO  Yoshiaki YAMAGUCHI  Ryuji SUGITA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.12   pp.1479-1483
Publication Date: 2013/12/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.1479
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced Elementary Technologies for Information Storage)
Category: 
Keyword: 
stacked perpendicular recording media,  media noise,  in-plane demagnetization,  magnetic cluster,  domain,  

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Summary: 
The uniform magnetic field of various strength was applied to the perpendicularly and in-plane demagnetized media, and the change in each magnetic cluster state was investigated as the fundamental investigation of the influence of demagnetization method on noise during signal recording on the stacked perpendicular recording media. The results showed that the in-plane demagnetization can achieve lower noise level if the recording field is not very high. In other words, the in-plane demagnetization is an effective way to achieve lower noise in transition area, near track edge of recorded bit, and in high-density bit. In addition, the simulation clarified that this noise reduction can be explained using the idea of sub-domain structure in the in-plane demagnetized media.