METHOD OF PRODUCING THIN-FILM POLYMER NANOCOMPOSITES FOR SUPERDENSE MAGNETIC INFORMATION RECORDING Russian patent published in 2014 - IPC H01F10/10 H01F41/14 B82B3/00 C23C26/00 G11C11/14 

FIELD: chemistry.

SUBSTANCE: method of producing polymer nanocomposites in form of thin films for superdense information recording involves producing a precursor consisting of polyvinyl alcohol, water and a mixture of water-soluble salts of ferric and ferrous iron, followed by treatment with at least one water-soluble dialdehyde at pH 0-3 in the presence of an acid as an acidifying agent, obtaining a thin film on a dielectric nonmagnetic substrate depositing the precursor on a substrate rotating on a centrifuge to form a gel film, treating the obtained gel film with an alkali, the alkali being added in an amount allows complete alkaline hydrolysis of the mixture of iron salts to form a mixture of magnetite or maghemite. The obtained gel film is treated with the alkali in ammonia vapour which is formed from aqueous ammonia solution (NH₄OH) or hydrazine hydrate (N₂H₄·H₂O) for 5.0-15.0 hours.

EFFECT: reduced particle size dispersion of magnetite and maghemite nanoparticles, obtaining a nanocomposite with a uniform structure, the obtained structure can be used as storage medium for superdense magnetic information recording.

2 dwg, 1 ex