Permanent magnet and method for preparation thereof

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

2005-08-16

2005-08-16

Koslow, C. Melissa (Department: 1755)

Compositions

Magnetic

Iron-oxygen compound containing

C252S062620, C252S062570, C428S690000, C428S690000

Reexamination Certificate

active

06929758

ABSTRACT:
A ferrite magnet obtained by adding either an oxide of Mn or oxides of Mn and Co 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 Mn or elements Mn and Co to the ferrite already having the hexagonal M-type magnetoplumbite structure during the fine pulverization process thereof, the magnetic properties can be improved.

REFERENCES:
patent: 5958284 (1999-09-01), Takami et al.
patent: 6086781 (2000-07-01), Taguchi et al.
patent: 6139766 (2000-10-01), Taguchi et al.
patent: 6630084 (2003-10-01), Oda
patent: 964411 (1999-12-01), None
patent: 54-16039 (1979-06-01), None
patent: 55-019046 (1980-05-01), None
patent: 06-267721 (1994-09-01), None
patent: 10-149910 (1998-06-01), None
patent: 11-246223 (1999-09-01), None
patent: 11-307331 (1999-11-01), None
patent: 2000-138116 (2000-05-01), None
patent: WO 98/38654 (1999-03-01), None
Wei et al. “The Temperature Dependence of Magnetic Properties of Zn-Ti Substituted Ba-ferrite Particles for Magnetic Recording” Journal of the Magnetics Society of Japan, vol. 21, Supplement No. S3 (1997) pp. 69-72.
Du et al. “Magentric Properties and High Temperature Composition of theLaxBa(1-X)Fe(12-x)ZnxO19Ferrites” Journal of the Magnetics Society of Japan, vols. 31-34 (1983), pp. 793-794.
G.A. Smolenskii et al.“Investigation of Ferrimagnets With the Structure of Magnetoplumbite and Garnet In Strong Pulse Magnetic Fields” and “Investigation of the Magnetic Properties of Some Ferromagnets With The Structure of Perovskite and Garnet” Bulletin of the Academy of Sciences of the USSR (Trans.) Physical Series, vol. 25 (1961) pp. 1405-1408.
Hiroshi Yamoto et al. “Magnetic Properties of Anisotropic Sr-La-System Ferrite Magnets”, IEEE Transactions of Magnetics vol. 26, No. 3, May 1990, pp. 1144-1148.
International Search Report (Mar. 12, 2002) English Translation.

Affiliated with

Also associated with

Rating

Permanent magnet and method for preparation thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Permanent magnet and method for preparation thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Permanent magnet and method for preparation thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3477270