Nanostructure of CoPtCr-SiO 2 granular films for magnetic recording media

Shunsuke Fukami, Nobuo Tanaka, Takehito Shimatsu, Osamu Kitakami

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Structural properties of CoPtCr-SiO 2 magnetic recording films grown on Ru or Pt seed layers prepared by UHV-magnetron sputtering were studied by high resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS) and energy filtered transmission electron microscopy (EFTEM). CoPtCr grown on Ru seed layers together with SiO 2 forms a well-isolated structure composed of CoPtCr fine grains of 10nm diameter surrounded by amorphous SiO 2, whereas CoPtCr grown on Pt seed layers together with SiO 2 forms a network structure composed of CoPtCr crystal of 5 nm size. These structural features made differences in their magnetic properties. The HRTEM and EFTEM studies revealed that cylindrical crystalline grains composed of CoPtCr and Ru are formed for CoPtCr-SiO 2/Ru samples, whereas SiO 2 are aggregated around the boundary between relatively large Pt grains and magnetic layers without obstructing the epitaxial growth of CoPtCr on Pt, not resulting in the cylindrical CoPtCr grains. Lattice spacings of CoPtCr grown on Pt with SiO 2 are 0.7% expanded in comparison with CoPtCr grown on Pt without SiO 2. The EELS studies suggested that Co and Cr atoms are partly oxidized by SiO 2 addition for both samples and Cr atoms are more oxidized for CoPtCr-SiO 2/Pt samples.

Original languageEnglish
Pages (from-to)1802-1806
Number of pages5
JournalMaterials Transactions
Issue number8
Publication statusPublished - 2005 Aug


  • CoPtCr-SiO
  • Electron energy loss spectroscopy
  • Energy filtered transmission electron microscopy
  • High resolution transmission electron microscopy
  • Perpendicular magnetic recording media

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


Dive into the research topics of 'Nanostructure of CoPtCr-SiO 2 granular films for magnetic recording media'. Together they form a unique fingerprint.

Cite this