Permanent magnet and method for preparation thereof

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

2006-02-07

2006-02-07

Koslow, C. Melissa (Department: 1755)

Compositions

Magnetic

Iron-oxygen compound containing

C252S062570, C252S062620, C428S690000, C428S690000

Reexamination Certificate

active

06994797

ABSTRACT:
A ferrite magnet obtained by adding at least one element selected from the group consisting of Co, Ni, Mn and Zn 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, and then subjecting the mixture to re-calcining and/or sintering process(es). 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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JP 2001-274010, Oct. 5, 2001, TDK Corporation (English Abstract).
Du et al., “Magnetic Properties and High Temperature Composition of the LaxBa(1-x)Fe(12-x)ZnxO19Ferrites”, Journal of Magnetism and Magnetic Materials 31-34 (1983) 793-794.
Smolenskii et al., “Investigation of Ferrimagnets with the Structure of Magnetoplubbite and Garnet in Strong Pulse Magnetic Fields”, Bulletin of the Academy of Sciences of the USSR, No. 11, vol. 25, (1961), pp. 1405-1408.
Wei et al., “The Temperature Dependence of Magnetic Properties of Zn-Ti Substituted Ba-Ferrite Particles for Magnetic Recording”, Journal of the Magnetics Society Japan, vol. 21, Supplement No. S2 (1997) pp. 69-72.
Yamamoto, “Magnetic Properties of Anisotropic Sr-La-System Ferrite Magnets”, IEEE Transactions on Magnetics, vol. 26, No. 3 May 1990 pp. 1144-1148.

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