Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2007-11-27

2007-11-27

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S848200

Reexamination Certificate

active

10874358

ABSTRACT:
A magnetic recording medium is provided, in which a high recording density is realized, and an electromagnetic transducing characteristic and an error rate are improved. The magnetic recording medium includes a non-magnetic layer containing a non-magnetic powder and a binder resin and a magnetic layer containing a ferromagnetic metal powder or hexagonal ferrite magnetic powder and a binder resin on one surface of a non-magnetic support, wherein the ferromagnetic metal powder has an average long axis length of 80 nm or less, or the hexagonal ferrite magnetic powder has an average tabular diameter in the range of from 10 to 40 nm, the three-dimensional center surface average roughness of the magnetic layer surface is 3.0 nm or less in a region of 100 μm2based on a measurement with an atomic force microscope, and the area share held by asperities of at least ±5.0 nm with reference to the surface at an average height is 15 percent or less in a region of 100 μm2on the magnetic layer surface.

REFERENCES:
patent: 6579592 (2003-06-01), Matsubaguchi et al.
patent: 2001-331924 (2001-11-01), None
patent: 2002-312920 (2002-10-01), None
patent: 2002-367140 (2002-12-01), None
U.S. Appl. No 10/868,914, filed Jun. 17, 2004, Kurose, et al.
U.S. Appl. No. 10/630,849, Jul. 31, 2003, Kurose.

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