Optimisation of bit patterned media for 1 Tb/in2

N. Degawa, Simon John Greaves, Hiroaki Muraoka, Y. Kanai

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Micromagnetic simulations were used to investigate the influence of patterned media geometry on the signal to noise ratio (SNR), adjacent track erasure and write margin for a target recording density of 1 Tb/in2. For an ideal patterned medium the readback noise was a maximum when the read head was directly over the dots and a minimum at the transitions. The SNR improved for smaller dots due to the larger dot separation. However, the ideal media with the highest SNR were also the most susceptible to dispersions of dot size and position. Low temperature simulations suggest that large write margins are available; however, at room temperature the write margin can be much reduced. Increasing the rise time of the write head had a deleterious effect on the write margin and the write margin was zero for rise times of more than 0.45 ns. Nevertheless, error-free writing at 1 Tb/in2 could be achieved using appropriate head geometries and material parameters.

Original languageEnglish
Pages (from-to)3092-3095
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Issue number22
Publication statusPublished - 2008 Nov 1


  • Patterned media
  • Perpendicular recording

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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