Ferrite Films Prepared by Pyrohydrolytic Deposition

Ferrite films of a nickel‐zinc‐cobalt composition have been deposited by pyrolytic hydrolysis of metal inorganic salts. The object of the research described in this paper was to deposit these films with a composition like that of a bulk ferrite of particular magnetic properties, and to evaluate the films in terms of structure, composition, and magnetic properties.The films are prepared by atomizing a mixed solution of the metal chlorides into a reaction tube heated to 800°C. The metal ion concentration in the starting solution is compensated to allow for excessive and varying loss of the constituents during the film‐forming process. The method used for determining the amount of starting solution compensation will be discussed along with a detailed description of the experimental apparatus.The films prepared by this technique exhibit the ferrite spinel structure, as is evidenced by x‐ray diffraction data.A value of 100 for the initial permeability of the films was measured by observing the film B‐H relatio...