Information Stability in Magnetic Recording

概要

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This study reveals the relationship between the grain number per bit, thermal stability factor, and standard deviation of grain size to bit error rate (bER) after 10 years of archiving in granular magnetic recording media when the grain number is reduced. Furthermore, this discussion is extended to 1 grain per bit (bit patterned media, BPM). To simulate the bER, random grain sizes with a normal distribution are generated, and the grain error probability is calculated. The bER worsens when the grain number per bit is decreased. Increasing the thermal stability factor and decreasing the standard deviation of the grain size improve the bER. We found that the BPM requires a higher thermal stability factor and/or a lower standard deviation of the grain size than granular media. The speed at which information degrades with a high thermal stability factor is different from that with a low factor even if the bERs after 10 years are the same.
公益社団法人日本磁気学会の論文