| abstract |
The invention relates to a method for producing acicular, magnetic iron oxide, consisting of a core of gamma-iron (III) oxide and one, based on the total amount of magnetic material, of 0.2 to 12 percent by weight of cobalt (II) - and 0, Ferrite shell containing 1 to 15 percent by weight of iron (II) ions, by applying a cobalt (II), iron (II) hydroxide solution to acicular gamma-iron (III) oxide particles and heating to 100 to 220 ° C. and the Use of the magnetic materials thus produced for the production of magnetic recording media. |