Plate-like ferrite particles with magnetoplumbite structure and

Details Plate-like ferrite particles with magnetoplumbite structure and Plate-like ferrite particles with magnetoplumbite structure and

1999-11-10

2000-08-08

Resan, Steven A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428403, 428405, 428407, 428694BH, 428900, G11B 5706

Patent

active

060999578

ABSTRACT:
The present invention relates to plate-like ferrite particles with magnetoplumbite structure having a composition represented by the general formula of AO.multidot.n{(Fe.sub.1-(a+b) Bi.sub.a M.sub.b).sub.2 O.sub.3 } wherein A is Ba, Sr or Ba--Sr; M is Zn--Nb, Zn--Ta or Zn--Sn; n is from 5.5 to 6.1; a is from 0.001 to 0.005; b is from 0.050 to 0.120; and the ratio of b/a is from 20 to 50. The plate-like ferrite particles with magnetoplumbite structure have an appropriate particle size, a low coercive force, a large saturation magnetization, a small switching field distribution (S.F.D.) and an excellent temperature stability, and a magnetic card containing the plate-like ferrite particles with magnetoplumbite structure.

REFERENCES:
patent: 5605753 (1997-02-01), Sanada et al.

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