Abstract: The present invention relates to phosphorus-containing ferromagnetic pigments comprising, in particular, from 30 to 70% by volume of a core, said core comprising essentially iron and cobalt, and from 30 to 70% of a shell, said shell comprising essentially aluminum, phosporus, silicon, oxygen, and optionally magnesium and sodium; the invention further relates to a process for preparation of said pigments, their use in magnetic recording materials and magnetic recording materials which contain such pigments.

Abstract: An improved process for the production of a magnetic recording material including a non-magnetic layer support and, cast thereon, a magnetic dispersion including a mixture of at least two different batches of finely divided magnetic pigments finely dispersed in a polymeric binder is characterized in that the magnetic pigment batches are separately finely dispersed in a polymeric binder and/or a dispersion aid and/or a solvent until the necessary degree of dispersion is reached, after which they are combined, optionally provided with further additives and applied to the layer support, the degree of dispersion of the magnetic dispersions preferably being continuously determined by a colorimetric arrangement.