Two-dimensional coding for probe recording on magnetic patterned media

J.P.J. Groenland, Leon Abelmann

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    Abstract

    The effect of intertrack intersymbol interference in a magnetic patterned medium is studied. A two-dimensional (2-D) channel code is proposed, dedicated to perpendicularly magnetized media without soft underlayer, which exhibit read pulses showing overshoot. Read pulse shapes were investigated using a magnetic-force microscope tip scanning the patterned medium row-by-row. To test different codes, a bit-detection simulation program was developed to generate large amounts of data on which bit error rates can be measured. Application of the 2-D channel code, which implies recording of particular dot positions with fixed bits ("ones", "zeros"), resulted in the elimination of 2-D worst-case bit patterns and a subsequent reduction of detected-bit errors. The accompanying redundancy of 22% is inevitable for this type of 2-D code.
    Original languageUndefined
    Article number10.1109/TMAG.2007.893137
    Pages (from-to)2307-2309
    Number of pages3
    JournalIEEE transactions on magnetics
    Volume43
    Issue number1, suppl./6
    DOIs
    Publication statusPublished - Jun 2007

    Keywords

    • TST-uSPAM: micro Scanning Probe Array Memory
    • TST-SMI: Formerly in EWI-SMI
    • Two-dimensional coding
    • Patterned Media
    • Magnetic force microscopy
    • intertrack interference
    • EWI-10287
    • METIS-241687
    • IR-64126
    • perpendicular magnetic recording

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