This invention relates to a process for the preparation of nanosized acicular magnetic iron oxide in magnetic field by biomimetic route. This invention particularly relates to a single step biomimetic route for the preparation of nanosized acicular maghemite in magnetic field which is used for the magnetic memory storage. The nanosized acicular maghemite particles, a form of iron oxide, in the range of 300-350 nm in size will be suitable as a particulate medium for perpendicular magnetic recording in general and in audio / video tapes in particular.
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