Patent ID: 6024890
Filing Date: 2000-02-15
Classification: G11B,H01F,Y10T

Abstract:
An acicular, ferromagnetic, iron- and cobalt-containing pigment, comprisinga) from 30 to 70 vol % of a core which comprises essentially cobolt and iron andb) from 30 to 70 vol % of a shell which comprises essentially aluminum, silicon, magnesium, phosphorus and oxygen, and containingfrom 5 to 20 mol of cobalt,from 1 to 5 mol of aluminum,from 3 to 10 mol of silicon,from 0.7 to 3.5 mol of phosphorus,less than 1 mol of magnesium, and oxygen,per 100 mol of the molar sum of iron and cobalt, the sum of the amounts per weight of the elements iron, cobalt, aluminum, silicon, phosphorus and oxygen being from 95 to 100% by weight, based on the total weight of the pigment.