Ru Alloy-Oxide Buffer Layer for Intergranular Exchange Decoupling of CoPt-B2O3 Granular Media

Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, Shin Saito

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Investigation of magnetic properties and microstructure for the Co80Pt20-30vol% B2O3 granular medium to clarify the effect of utilizing buffer layer (BL) on intergranular exchange coupling was conducted. It was found that the employment of a Ru50Co25Cr25-30vol% TiO2 BL with thickness of around 2 nm will avoid physical contact between magnetic grains in the initial growth region, which is effective to intergranular exchange decouple the magnetic grains. On the other hand, for deposition of BL thicker than 2 nm, underlayer will be flatten that brings the possibility of physical contact of magnetic grains and forms a granular film with strong intergranular exchange coupling.

Original languageEnglish
Article number8026181
JournalIEEE Transactions on Magnetics
Issue number2
Publication statusPublished - 2018 Feb


  • CoPt-BO granular media
  • RuCoCr-TiO buffer layer (BL)
  • high Hc
  • intergranular exchange coupling

ASJC Scopus subject areas

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

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