Self-organized growth of magnetic nanoporous thin film by alloy anodization

Anodization of alloys containing Al, Ni, Co and Fe as main constituents is reported here for the first time for formation of thin film of self-organized magnetic nanoporous structure. Fluoride concentration, anodization potential and the amount of water in the ethylene glycol electrolyte are very critical parameters to produce the well-aligned nanostructure. Further, the presence of Al in the alloy to protect the ferrite nanostructure by controlling the selective dissolution of oxide layers of Ni, Co, Cu was essential.

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► Anodization of “Alnico” alloy in F− containing aged ethylene glycol electrolyte.
► Formation of self-organized nanoporous thin film of ferrites.
► Critical parameters: F− and H2O content and anodization potential.
► “Al” in the alloy is very essential to protect the ferrite nanostructure.