An inductive component includes a core being formed of high-permeability MnZn ferrites having a secondary permeability maximum at a temperature <0.degree. C. Electrically insulating material encapsulates the core.

A continuous process is disclosed for producing barium or strontium ferrites, starting from iron oxide and barium or strontium carbonates, wherein A. a slurry consisting of iron oxide, barium or strontium carbonate, water and binder, is dried and granulated, utilizing the hot gases flowing from step (b) supplemented with hot burnt gases obtained separately; B. the granules obtained in step (a) are calcined, for 0.5-4 hours at 950.degree.-1150.degree.C, in a fluid bed reactor, heated by combustio...

A process for the preparation of finely divided and acicular hexagonal ferrites of the general formula AMe.sub.x Fe.sub.12-x O.sub.19, where x is .ltoreq.4, A is barium and/or strontium and Me is indium or equimolar amounts of zinc or cobalt and titanium, and their use for the production of magnetic recording media and plastoferrites.