Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2006-02-07

2006-02-07

Resan, Stevan A. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

Reexamination Certificate

active

06994925

ABSTRACT:
To provide a magnetic recording medium which undergoes little effect of thermal fluctuation and provides a high short wavelength output and C/N ratio when reproduction is conducted using MR head, the magnetic recording medium includes a non-magnetic layer having a non-magnetic powder dispersed in a binder provided on a support and a magnetic layer having a ferromagnetic powder dispersed in a binder provided on the non-magnetic layer, wherein the ferromagnetic powder comprises a hexagonal ferrite magnetic powder having an average diameter of from 10 to 35 nm and a coercive force of from 135 to 400 kA/m; the magnetic layer has a coercive force of from 135 to 440 kA/m; and a product of an anisotropic magnetic field of the magnetic layer and an average particle volume of the hexagonal ferrite magnetic powder is from 1.2×106to 2.4×106kA/m·nm3.

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patent: 6777073 (2004-08-01), Nakamikawa et al.
patent: 2004/0001974 (2004-01-01), Sharrock
T. Tanaka, et al., “Delta-M Measurement and Magnetization Thermal Stability for BA Ferrite Media”, Nihon Oyo Jiki Gakkaishi, 2002, 26(4), pp. 258-262.

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