Patent ID: 6699579
Filing Date: 2004-03-02
Classification: B22F,C22C,C25C,C25D,H01F,Y10S,Y10T

Abstract:
Magnetic particulates containing cobalt, and iron, having high magnetic permeability and having controlled dimensions including a desired thickness controlled within a narrow thickness distribution, made by the process comprising the steps of:(a) electroplating a substantially uniformly thick layer of metal, including the iron, and cobalt in sufficient amount to make the metal magnetic, onto a cathode from an electrolyte, the desired thickness being in the range from about 0.1 &mgr;m to 1.0 &mgr;m; (b) separating the layer from the cathode to define flakes in the electrolyte that have the same planar shape and a size on the order of (no more than about 0.001 inch long)Ã—(no more than about 0.001 inch wide)Ã—(the desired thickness); and (c) separating the flakes from the electrolyte.