Perpendicular magnetic recording medium

Details Perpendicular magnetic recording medium Perpendicular magnetic recording medium

2008-09-26

2011-11-15

Rickman, Holly (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

08057926

ABSTRACT:
The present invention provides a perpendicular magnetic recording medium that can reduce noise by further size reduction and isolation of magnetic grains in a magnetic recording layer and can increase the recording density by improvement of the SNR. A typical configuration of a perpendicular magnetic recording medium according to the present invention is a perpendicular magnetic recording medium having a magnetic recording layer with a granular structure in which non-magnetic grain boundary portions are formed between magnetic grains that have grown continuously in a columnar shape, wherein the grain boundary portions contain a plurality of kinds of oxides.

REFERENCES:
patent: 2002/0136929 (2002-09-01), Oikawa et al.
patent: 2006/0154113 (2006-07-01), Watanabe et al.
patent: 2007/0042227 (2007-02-01), Iwasaki et al.
patent: 2008/0062575 (2008-03-01), Shimizu
patent: 2009/0081483 (2009-03-01), Sonobe et al.
patent: 2005-100537 (2005-04-01), None
patent: 2006-024346 (2006-01-01), None
patent: 2006-164440 (2006-06-01), None
patent: 2006-268972 (2006-10-01), None
T. Oikawa, et al., “Microstructure and Magnetic Properties of CoPtCr-SiO2Perpendicular Recording Media”, IEEE Transactions on Magnetics, Sep. 2002, pp. 1976-1978, vol. 38, No. 5.

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