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Magnetic recording medium

  • US 6,994,925 B2
  • Filed: 10/21/2004
  • Issued: 02/07/2006
  • Est. Priority Date: 10/22/2003
  • Status: Active Grant
First Claim
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1. A magnetic recording medium, which comprises:

  • a support;

    a non-magnetic layer comprising a binder and a non-magnetic powder; and

    a magnetic layer comprising a binder and a ferromagnetic powder,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×

    106 to 2.4×

    106 kA/m·

    nm3.

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