The thermodynamic limits of magnetic recording

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2012
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Richter, H. J.
Lyberatos, Andreas
Evans, Richard Francis L.
Chantrell, Roy W.
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Thermal stability of the recorded information is generally thought to set the limit of the maximum possible density in magnetic recording. It is shown that basic thermodynamics always cause the probability of success of the write process to be less than 100%. This leads to a thermally induced error rate, which eventually limits the maximum possible density beyond that given by the traditional thermal stability limit. While the thermally induced error rate is negligible for recording of simple single domain particles, it rapidly increases in the presence of a write assist, in particular if the write assist is accomplished by an increased recording temperature. For the ultimate recording system that combines thermally assisted writing with a recording scheme that uses one grain per bit, the upper bound for the maximum achievable density is 20 Tbit/inch² for a bit error rate target of 10ˉ².

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530 Physik
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thermodynamic limits, error analysis, magnetic domains, magnetic recording, thermal stability
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ISO 690RICHTER, H. J., Andreas LYBERATOS, Ulrich NOWAK, Richard Francis L. EVANS, Roy W. CHANTRELL, 2012. The thermodynamic limits of magnetic recording. In: Journal of Applied Physics. 2012, 111(3), 033909. ISSN 0021-8979. Available under: doi: 10.1063/1.3681297
BibTex
@article{Richter2012therm-18550,
  year={2012},
  doi={10.1063/1.3681297},
  title={The thermodynamic limits of magnetic recording},
  number={3},
  volume={111},
  issn={0021-8979},
  journal={Journal of Applied Physics},
  author={Richter, H. J. and Lyberatos, Andreas and Nowak, Ulrich and Evans, Richard Francis L. and Chantrell, Roy W.},
  note={Article Number: 033909}
}
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