Title:
HEXAGONAL FERRITE MAGNET
Document Type and Number:
WIPO Patent Application WO/1999/067795
Kind Code:
A1
Abstract:
Intended is to realize a hexagonal ferrite magnet having both a high remanent magnetic flux density and a high coercive force which has never achieved with a conventional M type hexagonal ferrite magnet by enhancing, at the same time, the saturation magnetization and the magnetic anisotropy of a M type ferrite. Such a characteristic can be achieved by preparing a hexagonal ferrite magnet which contains A, R and Fe, wherein A represents at least one element selected from among Sr, Ba and Ca and R represents an element which may take a valence of +3 or +4 and has an ionic radius of 1.00 angstrom or more, and has a value of n/N of 0.35 or less, wherein n represents the number of crystal grains having stacking fault and N represents the total number of crystal grains.
Inventors:
TAGUCHI HITOSHI
MASUZAWA KIYOYUKI
MINACHI YOSHIHIKO
IIDA KAZUMASA
MASUZAWA KIYOYUKI
MINACHI YOSHIHIKO
IIDA KAZUMASA
Application Number:
PCT/JP1999/001411
Publication Date:
December 29, 1999
Filing Date:
March 19, 1999
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
C04B35/26; H01F1/10; (IPC1-7): H01F1/11
Foreign References:
| JPH10149910A | 1998-06-02 | |||
| JPH09115715A | 1997-05-02 |
Other References:
See also references of EP 1011114A4
Attorney, Agent or Firm:
Ishii, Yoichi (3F 23-1, Yushima 3-chome Bunkyo-ku Tokyo, JP)
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