Effects of very thin carbon seedlayer on formation of hcp phase for CoCrPtB/Co60Cr40 perpendicular magnetic recording media

Shin Saito, Fumikazu Hoshi, Migaku Takahashi

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


This paper reports on significant improvement of magnetic properties for CoCrPtB/Co60Cr40 perpendicular recording media by utilizing very thin C seedlayer even with the thickness of less than 1 nm. This is caused by the following microstructural characteristic: 1) the C seedlayer, heated to higher than 200 °C, reacts with CoCr intermediate layer, and results in the formation of nanocrystalline layer with the thickness of about 6 nm; 2) Cr-deprived hcp grains with Cr segregation structure grow on the nanocrystalline layer without forming σ-phase grains in the intermediate layer; 3) CoCrPtB magnetic layer epitaxially grows on the intermediate layer without forming initial layer, which behaves as soft ferromagnetic layer and degrades magnetic properties of the media.

Original languageEnglish
Pages (from-to)1985-1987
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - 2002 Sep
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2


  • CoCr intermediate layer
  • Epitaxial growth
  • Very thin C seedlayer
  • σ-phase

ASJC Scopus subject areas

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

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