Fabrication and MFM study of 60 nm track-pitch discrete track media

Jin Seung Sohn, Duhyun Lee, Eunhyoung Cho, Hae Sung Kim, Sang Chul Sul, Byung Kyu Lee, Myung Bok Lee, Changyoul Moon, No Cheol Park

Research output: Contribution to journalArticle

2 Citations (Scopus)


Discrete track magnetic recording media with a 60 nm track pitch and prewritten servo patterns were fabricated and tested for read/write performance, and a feasibility analysis of the embedded servo was performed. The fabrication process consisted of ultraviolet nanoimprint lithography (UV-NIL) and sequential ion beam etching on a conventional perpendicular magnetic recording medium. Magnetic patterns were written to the fabricated tracks at 700 kilo flux changes per inch (kFCI) using a spin stand and were read using magnetic force microscopy (MFM), with a resulting signal-to-noise ratio (SNR) of 12.15 dB. The servo pattern was also visualized with MFM. These results demonstrated the feasibility of writing to a 30 nm wide discrete data track and the workability of the embedded servo pattern.

Original languageEnglish
Article number035305
Issue number3
Publication statusPublished - 2011 Jan 21

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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    Sohn, J. S., Lee, D., Cho, E., Kim, H. S., Sul, S. C., Lee, B. K., Lee, M. B., Moon, C., & Park, N. C. (2011). Fabrication and MFM study of 60 nm track-pitch discrete track media. Nanotechnology, 22(3), [035305]. https://doi.org/10.1088/0957-4484/22/3/035305