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Plate-like ferrite particles with magnetoplumbite structure and magnetic card using the same

  • US 6,099,957 A
  • Filed: 11/10/1999
  • Issued: 08/08/2000
  • Est. Priority Date: 03/04/1997
  • Status: Expired due to Term
First Claim
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1. A magnetic card comprising:

  • (i) a substrate; and

    (ii) magnetic recording layer formed on said substrate comprising said plate-like ferrite particles with magnetoplumbite structure, having a composition represented by the general formula of AO·

    n{(Fe1-(a+b)Bia Mb)2 O3 } 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, and a binder resin.

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