Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2008-05-20

2008-05-20

Rickman, Holly (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

07374831

ABSTRACT:
A distribution of grain boundaries in a magnetic recording medium having a granular structure is reduced so that the magnetic recording medium with a high medium signal-to-noise ratio is provided. According to one embodiment, in an underlayer composed of grains each having a generally columnar structure and in a magnetic recording layer composed of magnetic crystal grains each having a generally columnar structure and grain boundaries, a grain size Dm of the magnetic recording layer and a grain size Du of each of the underlayer crystal grains are determined to satisfy a relationship represented by 0.8×Du≦Dm<Du and a standardized grain boundary distribution obtained by dividing the standardized deviation of the distribution of the grain boundaries by an average grain boundary width is adjusted to about 0.4 or less.

REFERENCES:
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patent: 7147942 (2006-12-01), Uwazumi et al.
patent: 2003/0049498 (2003-03-01), Shimosato
patent: 2001-283428 (2001-10-01), None
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patent: 2003-115106 (2003-04-01), None
patent: 2003-178413 (2003-06-01), None

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