Bit density dependence of NLTS in perpendicular magnetic recording

Hiroaki Muraoka, Yoshihisa Nakamura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Nonlinearity of perpendicular magnetic recording using a single-pole writing head and an MR head associated with a double layered medium was investigated by the dipulse echo extraction method up to 300 kFRPI and a simulation. The nonlinear transition shift (NLTS) was 6% of bit length even in 300 kFRPI. The NLTS in length was gradually decreases according to the density increment. The NLTS was measured for the condition of less than - 40 dB overwrite, thus, no influence of head saturation was confirmed. This result was well agree with the proven high recording resolution of perpendicular magnetic recording. By investigation based on the simulation, the shape of the extracted echo for the perpendicular head/medium showed that it consisted not only of NLTS by one bit prior, but also of slight width change of the proceeding pulse by a preceding transition. Through this study, perpendicular magnetic recording with an head showed good linearity which was suitable for recent signal processing for high density recording.

Original languageEnglish
Pages (from-to)1480-1484
Number of pages5
JournalKyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers
Issue number10
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Media Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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