CoCrPtTa and Co/Pd perpendicular magnetic recording media with amorphous underlayers

T. Onoue*, T. Asahi, K. Kuramochi, J. Kawaji, T. Homma, T. Osaka

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


The effect of amorphous carbon underlayers on magnetic properties and read-write characteristics of Co73Cr18Pt8Ta3 single layer and Co/Pd multilayer perpendicular magnetic recording media were investigated. The increase in Hc and decrease in α, defined as 4π(dM/dH)H=Hc, were observed by increasing the underlayer thickness for both Co73Cr18Pt6Ta3 and Co/Pd media. The media with a low α value, suggesting a decrease in the exchange coupling, exhibited the higher coercivity and the improvement of S/N ratio. In read-write experiments, the improvement of S/N ratio for the Co/Pd media was achieved up to 400 kFRPI or even higher in the recording density by increasing carbon underlayer thickness, while that for the Co73Cr18Pt6Ta3 media was obtained up to ca. 250 kFRPI.

Original languageEnglish
Pages (from-to)1592-1594
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number4 I
Publication statusPublished - 2001 Jul
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11


  • Amorphous underlayer
  • Co/Pd multilayer media
  • Exchange coupling
  • Perpendicular magnetic recording

ASJC Scopus subject areas

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


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