Ferrite magnetic material and process for producing the same

Details Ferrite magnetic material and process for producing the same Ferrite magnetic material and process for producing the same

2005-10-28

2008-09-16

Koslow, C. Melissa (Department: 1793)

Compositions

Magnetic

Iron-oxygen compound containing

C252S062570

Reexamination Certificate

active

07425280

ABSTRACT:
The present invention provides a ferrite magnet material comprising, as a main phase, a ferrite having a hexagonal structure, the main phase containing A, La, R, Fe and Co, wherein A is at least one element selected from Sr, Ba and Pb, R is Pr and/or Nd, and the proportions of the total metal elements A, La, R, Fe and Co in the main phase are respectively A: 1 to 13 atomic %, La: 0.003 to 10 atomic %, R: 0 to 10 atomic % (excluding 0) Fe: 80 to 95 atomic % and Co: 0.05 to 5 atomic % based on the total amounts of metal elements. The residual magnetic flux density Br and coercive force HcJ can be improved without increasing the content of Co by incorporating Pr and/or Nd along with La and Co in the ferrite magnet material.

REFERENCES:
patent: 5958284 (1999-09-01), Takami et al.
patent: 6139766 (2000-10-01), Taguchi et al.
patent: 1217812 (1999-05-01), None
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patent: 2002-175907 (2002-06-01), None
patent: 2003-151811 (2003-05-01), None
patent: 100359547 (2002-10-01), None
Translation for JP 2002-175907.
English translation of Chinese language office action for corresponding Chinese application No. 200510118623.x (the Chinese language office action was filed in a previous IDS on Oct. 24, 2007).

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