Title:
MAGNETIC RECORDING MEDIUM, AND MAGNETIC POWDER AND METHOD FOR PREPARING THE SAME
Document Type and Number:
WIPO Patent Application WO/2000/048210
Kind Code:
A1
Abstract:
A rare earth-iron-boron type magnetic powder comprising a rare earth element, iron and boron, characterized as having a coercive force of 80 to 400 kA/m, a saturation magnetization of 10 to 25 $g(m)Wb/g, an average particle size in the range of 5 to 200 nm, and a form of from sphere to ellipse; and a magnetic recording medium having a magnetic layer comprising the magnetic powder and a binder. The magnetic recording medium can be used for rendering commercially practical an extra-thin magnetic layer having a thickness of 0.3 $g(m)m or less, which has been difficult to produce commercially in a conventional coating-type recording medium using a magnetic powder of a needle form.
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Inventors:
KISHIMOTO MIKIO (JP)
Application Number:
PCT/JP2000/000661
Publication Date:
August 17, 2000
Filing Date:
February 08, 2000
Export Citation:
Assignee:
HITACHI MAXELL (JP)
KISHIMOTO MIKIO (JP)
KISHIMOTO MIKIO (JP)
International Classes:
C22C1/04; G11B5/706; H01F1/057; (IPC1-7): H01F1/06; G11B5/706; G11B5/712; G11B5/70; C22C33/02
Foreign References:
| JPH05152115A | 1993-06-18 | |||
| JPH09251910A | 1997-09-22 |
Other References:
See also references of EP 1071102A4
Attorney, Agent or Firm:
Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku, Osaka-shi Osaka, JP)
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