Permanent magnet and method for preparation thereof

Details Permanent magnet and method for preparation thereof Permanent magnet and method for preparation thereof

2006-12-05

2006-12-05

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S842800, C148S100000, C148S105000, C419S020000, C419S055000

Reexamination Certificate

active

07144642

ABSTRACT:
A ferrite magnet obtained by adding a ferrite having a hexagonal W-type magnetoplumbite structure to a ferrite having a hexagonal M-type magnetoplumbite structure, in which a portion of Sr, Ba, Pb or Ca is replaced with at least one element that is selected from the group consisting of the rare-earth elements (including Y) and Bi and that always includes La, during the fine pulverization process thereof. By adding a small amount of the element such as Co, Ni, Mn or Zn to the ferrite already having the hexagonal M-type magnetoplumbite structure during the fine pulverization process thereof, the magnetic properties can be improved.

REFERENCES:
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Machine translation of JP 2000-323315, Yamada et al., Nov. 2000.
Patent Abstracts of Japan 06-290924 Dated Oct. 18, 1994.
Patent Abstracts of Japan 2000-323315 Dated Nov. 24, 2000.
Du et al., “Magnetic Properties and High Temperature Composition of the LaxBa(1-x)Fe(12-x)ZnxO19Ferrites”, Journal of Magnetism and Magnetic Materials, vol. 31-34, (1983) pp. 793-794.
Smolenskii et al., “Investigation of Ferrimagnets With the Structure of Magnetoplumbite and Garnet in Strong Pulse Magnetic Fields”&“Investigation of the Magnetic Properties of Some Ferromagnets With the Structure of Perovskite and Garnet”, Bulletin of the Academy of Sciences of the USSR, Physical Series, vol. 25 No. 11, (1961) pp. 1405-1408.
Wei et al., “The Temperature Dependence of Magnetic Properties of Zn-Ti Substituted Ba-Ferrite Particles for Magnetics Recording”, Journal of the Magnetics Society of Japan, vol. 21, Sup. No. S2 (1997) pp. 69-72.
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