Planarization of patterned recording media

S. N. Piramanayagam*, Rachid Sbiaa, Ei Leen Tan, Allen Wei Choong Poh, Hang Khume Tan, Kyaw Oo Aung, Jinmin Zhao, Seng Kai Wong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The planarization of patterned recording media is essential to overcome the "flying height reduction" and "flying instability" of the head-slider. This paper reports two planarization techniques; one by compressing a morphological smooth surface onto a low glass transition temperature T g /UV curable polymer/material coated patterned sample, while the other employs spin coating to coat patterned disks. A roughness of 0.3 nm was achieved by planarization using compression of smooth Si onto 35 K PMMA (heated above Tg to decrease its viscosity). It was also found that decreasing the spin speed from 5000 rpm to 1000 rpm improves the filling of grooves using spin coating of hydrogen silsesquioxane (HSQ) decreasing the height difference between the filled groove region and the land region from about 6 nm to 4 nm. Initial investigation using compression of smooth Si onto diluted HSQ also shows a decrease of roughness as dilution increases from 50.0% to 66.6%. Both techniques were applied in the planarization of a UV curable resist. The results show that about 1 nm is observed between the patterned and unpatterned regions using only spin coating. However, with compression using a flat mold, no height difference on average is observed.

Original languageEnglish
Pages (from-to)758-763
Number of pages6
JournalIEEE Transactions on Magnetics
Issue number3 PART 1
Publication statusPublished - Mar 2010
Externally publishedYes


  • Index Terms-Hard disk media
  • Patterned recording medium
  • Planarization
  • Tribology

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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