Relationship between Crosstalk and Readout Magnetic Field Direction on Trilayer Magnetically-Induced Super Resolution Media

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Abstract
Land/groove recording was conducted on the trilayer double-mask MSR media. A CNR of 47 dB was obtained for a mark length of 0.33 µ m and track pitch of 0.7 µ m. The crosstalk was negligibly low when the readout magnetic field was applied in the writing direction. Random jitter was 10%, even when the data were recorded on the adjacent tracks, assuming (1, 7)-RLL encoding. This implies that an areal density of 3.69 Gbits/inch2 is possible. The crosstalk changed drastically depending on the readout magnetic field direction. It was found that the area of the front mask was larger when the readout field was applied in the writing direction, compared to the readout field in the erasing direction. This explains the big difference in crosstalk due to the readout field direction.

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