Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2006-01-31

2006-01-31

Resan, Stevan A. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S840600

Reexamination Certificate

active

06991861

ABSTRACT:
The coating-type magnetic recording medium has a non-magnetic layer mainly composed of a non-magnetic powder and binder, and a magnetic layer mainly composed of a ferromagnetic powder and a binder, which are stacked in this order on a non-magnetic substrate, wherein dispersion σL/L of long-axis length of all ferromagnetic powder particles contained in the magnetic layer falls in a range of σL/L≦±10%, where L is an average long-axis length and σL is a standard deviation thereof, and dispersion σW/W of short-axis length of all ferromagnetic powders contained in the magnetic layer falls in a range of σW/W≦±15%, where W is an average short-axis length and σW is a standard deviation thereof. The average long-axis length L is typically adjusted within the range of 0.08 μm and 0.12 μm, and the Switching Field Distribution (SFD) of the medium is adjusted to 0.25 or less.

REFERENCES:
patent: 6203934 (2001-03-01), Naoe et al.
patent: 6689456 (2004-02-01), Nakazawa et al.
patent: 60-021307 (1985-02-01), None
patent: 60-147929 (1985-08-01), None

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