Magnetic Thin Film Formation Reaction of Ferrites in Aqueous Solution

Abstract

When the ferrite-plating method was used, ferrite films could be piled up on various substrates at 50-90°C in aqueous solution. On the basis of our experimental results, the ferriteplating reactions were herein discussed, and some discrepancies among three typical methods: “rotating disc method”, “thin liquid-film method” and “spray-spin-coating method, ” were recognized. According to the relationships among the film deposition rate, the preferential texturing, the concentration of the oxidizing reagents and the electrochemical characteristics on the surface of the ferrite-layer, two types of reaction were postulated. These took place under Fe²⁺-rich and/or oxidation conditions on the surface of the ferritelayer. The formation of ferrite films seemed to be a result of the dissolution-deposition process under the condition of Fe²⁺-rich side.