IEEE Transactions on Magnetics

Ion projection direct structuring for patterning of magnetic media

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Ion projection facilitates a direct structuring, which is an attractive potential manufacturing process for patterned storage media. An advantage to this method is that the media roughness remaines unchanged. The feasibility of ion projection direct structuring for processing full disk surfaces was investigated using a next generation lithography projector. Co-Pt multilayer films with strong perpendicular anisotropy were deposited on 1-in glass disks as used in the IBM microdrive and on Si substrates. Concentric tracks including data, as well as head positioning servo structures, were patterned in a single exposure step with 45 kev He+ at a 4 × demagnification. In a second experiment, sub-100-nm magnetic islands were produced using projection at 8.7 × demagnification and visualized by magnetic force microscopy.