High Ku and low intergranular exchange coupling of postannealed CoPt-WO3 granular film

Kim Kong Tham, Shintaro Hinata, Shin Saito, Migaku Takahashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Magnetic properties and microstructure of Co80Pt20-30 vol.% (Al2O3, TiO2, WO3) and Co82.4Pt17.6-27.7 vol.% SiO2 granular films postannealed at various temperatures in a heat-treating furnace were investigated. In this paper, it is found that among these granular films, CoPt-WO3 granular film shows the highest coercivity (Hc) because of low intergranular exchange coupling of well-isolated magnetic grains. Furthermore, the Hc is enhanced with postannealing because of the increase of the magnetic anisotropy field (Hkgrain) and uniaxial magnetocrystalline anisotropy (Kugrain) of the columnar growth magnetic grains. The increase of Kugrain for the postannealed granular film primarily originates from the reduction of the stacking faults as well as the lattice constant ratio.

Original languageEnglish
Article number6971658
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 2014 Nov 1


  • CoPt-WO granular film
  • high K
  • perpendicular magnetic recording
  • postannealing

ASJC Scopus subject areas

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

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