Two-dimensional coding for probe recording on magnetic patterned media


Groenland, J.P.J. and Abelmann, L. (2007) Two-dimensional coding for probe recording on magnetic patterned media. IEEE transactions on magnetics, 43 (6). pp. 2307-2309. ISSN 0018-9464

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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.
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Copyright:© 2007 IEEE
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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