New developments in ferrite plating

The ferrite plating - a method synthesizing ferrite films from an aqueous solution - has developed lately as follows; (1) Applying power ultrasound to aqueous solution improves the qualities of ferrite costing on polymer microspheres much, (2) similarity is found between mechanisms of the ferrite plating and bacterial Fe3O4 (magnetsome) synthesis, (3) using highly alkaline (pH=13) solution containing a chelating agent increases the solubilities of such particular ions as Mn2+ and Ba2+ in ferrite-plated films, and (4) Fe3O4/CdS multilayer films are synthesized from a wet chemical process. Applications are proposed of ferrite-plated films to (5) backlayers for CoCr perpendicular magnetic recording media, (6) contrast agents for ultrasonography, and (7) catalyst for decomposing aqueous residual chlorine.